| Analysis of the search query | why do human gametes have only 23 chromosomes |
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Top competitors on query "why do human gametes have only 23 chromosomes"
http://blog.23andme.com/ancestry/did-humans-and-neanderthals-have-sex/ Competition: low
But a counter argument published in PNAS, asserts that the shared DNA found in both modern humans and our Neanderthal cousins may have come from common African ancestors. Without meaning to get all People magazine on you, the question about whether modern humans and Neanderthals hooked up has again become a subject of scientific debate
Sandwalk: The Genetics of Eye Color
http://sandwalk.blogspot.com/2007/02/genetics-of-eye-color.html Competition: low
If a person has always had two different colored eyes, then this is called congenital heterochromia and is cause by a difference in the early stages of development of the iris. So Mum has genes Bb will give each child either the brown eye gene or the blue eye gene and Dad has gene Gb so he will give each child either the green eye gene or the blue eye gene.Children will inherit the following combinations Bb - Brown eyesGb - Green eyesbb - Blue eyesBG - this is an interesting one likely to be Brown, dominant over green or a very dark green.As I have said in a previous post; there are more genes than this involved so it is a lot more complicated so there are a lot more variations but this does give an example of how one gene can cause 4 variations
http://www.ehow.com/facts_5207244_many-found-human-body-cells_.html Competition: low
The cell's nucleus primarily contains chromosomes, in addition to the nucleolus and protein particles, that are organized in pairs of sequences that replicate (duplicate) during cellular reproduction. The sex cells are produced through meiosis, a process which adds another step to the cell reproduction cycle so that the chromosome pairs are split, enabling sex cells to combine later during fertilization
Sex - Simple English Wikipedia, the free encyclopedia
http://simple.wikipedia.org/wiki/Sex Competition: low
Because genetic sex determination is controlled by a pair of sex chromosomes (or by the presence or absence of one of the chromosomes), there are usually the same number of male and female offspring
http://www.ksu.edu/biology/pob/genetics/defin.htm Competition: low
homologous chromosomes A pair of chromosomes in the same individual that carry the same type of information (eye color) but not necessarily the same alleles (blue or brown). At At at at AT AATt AATt AaTt AaTt AT AATt AATt AaTt AaTt At AAtt AAtt Aatt Aatt At AAtt AAtt Aatt Aatt recessive An allele which must be homozygous for it's effect to be observed
Human Evolution Timeline in Bible Quotes
http://www.bible-quotes-science-info.com/art/human-evolution-timeline.htm Competition: low
Parallelism between Adam's rib and science - There is an amazing coincidence between the numbers in the Bible involving creationism and numbers in science regarding man's evolution from the ape. In a nutshell, this is what we have: *Number of ribs in the human being: 24 *Number of chromosomes in the chimp's gametes: 24 *Creation: removal of one rib
Chromosomes and Sex
http://biology.about.com/od/basicgenetics/p/chromosgender.htm Competition: low
The zygote is diploid, meaning that it contains two sets of chromosomes.Sex Chromosomes X-Y:The male gametes or sperm cells in humans and other mammals are heterogametic and contain one of two types of sex chromosomes. If a sperm cell containing no sex chromosome fertilizes an egg, the resulting zygote will be XO or male.Sex Chromosomes Z-W:Birds, insects like butterflies, frogs and some species of fish have a different system for determining gender
http://www.apologeticspress.org/APContent.aspx?category=9&article=801 Competition: low
How then was it propagated from one individual to his or her offspring and eventually to every human? Chromosomal rearrangements of this nature are not easily passed to offspring. Miller and a host of evolutionists have jumped on this alleged chromosomal fusion as evidence that humans, the chimpanzee, and other hominids all descended from one common ancestor
Chromosome Abnormalities Fact Sheet
http://www.genome.gov/11508982 Competition: low
An example of a condition caused by numerical abnormalities is Down Syndrome, also known as Trisomy 21 (an individual with Down Syndrome has three copies of chromosome 21, rather than two). One set of 23 chromosomes is inherited from the biological mother (from the egg), and the other set is inherited from the biological father (from the sperm)
Chromosomes in cells - Human Molecular Genetics - NCBI Bookshelf
http://www.ncbi.nlm.nih.gov/books/NBK7572/ Competition: low
At the early stages of development, individual cells in the embryo are totipotent: each cell retains the capacity to differentiate into all the different types of cell in the body. Other cells (often distinguished by the suffix -blast , as in osteoblasts, chondroblasts, myoblasts, etc.) divide actively and act as precursors of terminally differentiated cells
Chromosome - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Chromosomes Competition: low
Compaction of the duplicated chromosomes during mitosis and meiosis results in the classic four-arm structure (pictured to the right) if the centromere is located in the middle of the chromosome or a two-arm structure if the centromere is located near one of the ends. In the nuclear chromosomes of eukaryotes, the uncondensed DNA exists in a semi-ordered structure, where it is wrapped around histones (structural proteins), forming a composite material called chromatin
http://www.princeton.edu/~prolife/articles/wdhbb.html Competition: low
(See Irving and Kischer, The Human Development Hoax: Time To Tell The Truth!, for extensive details and references.) But it roughly goes back to at least 1979 in the bioethics writings of Jesuit theologian Richard McCormick in his work with the Ethics Advisory Board to the United States Department of Health, Education and Welfare,18 and those of frog developmental biologist Dr. Clifford Grobstein in a 1979 article in Scientific American,19 and most notably in his classic book, Science and the Unborn: Choosing Human Futures (1988).20 Both McCormick and Grobstein subsequently continued propagating this scientific myth as members of the Ethics Committee of the American Fertility Society, and in numerous influential bioethics articles, leading to its common use in bioethics, theological, and public policy literature to this day
http://biology.clc.uc.edu/courses/bio104/mitosis.htm Competition: low
Each of these cultures can be subjected to a different drug, thus enabling doctors to find the right drug sooner, while it may still be of help, and without needlessly subjecting the person to many kinds of toxic chemicals. The nuclear envelope has totally disintegrated and the polar fibers have reached the centromeres of the chromosomes and have begun interacting with them
Gamete - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Gamete Competition: low
This mutation, recombination, and the fact that the two chromosome sets ultimately come from either a grandmother or a grandfather on each parental side account for the genetic dissimilarity of siblings. The male haploid is pollen and is produced by the anther, when pollen lands on a mature stigma (botany) of a flower if grows a pollen tube down into the flower
How many chromosomes are in a human gamete
http://wiki.answers.com/Q/How_many_chromosomes_are_in_a_human_gamete Competition: low
How many chromosomes in human gamete? 23, there are 23 chromosomes in human gametes How many chromosomes does a human gamete have after meiosis? 23 How many chromosomes are in a female human gamete? There are 23 chromosomes in a female human gamete
How many chromosomes do human body cells have
http://wiki.answers.com/Q/How_many_chromosomes_do_human_body_cells_have Competition: low
How many chromosomes are in the nucleus of human body cells? 46 How many chromosomes are present in a normal human body cell? There are 46 chromosome in the human body cell.23 each from mom and dad A typical human body cell has how many chromosomes? 46 How many chromosomes in the human body? There are 46 chromosomes. Improve Answer History Related Answers: How many chromosomes do human body cells have? 46 Chromosomes in the Human body cells.Body cells have "pairs" of chromosomes while sex cells have o How many pairs of chromosomes are found in human body cells? There are 23 pairs or 46 individual chromosomes in a humans cells
http://uk.answers.yahoo.com/question/index?qid=20100913141717AAdnVUN Competition: low
Within each parent (the mother or the father), the chromosomes in the germ cells intertwine and parts cross over from one chromosome to another in the pair. No, every body has not a single DNA molecule but at least 46 DNA molecules (and not 23 because as I explained the DNA molecules of two homologous chromosomes are not the same) in the nucleus of each cell
http://uk.answers.yahoo.com/question/index?qid=20110108092356AAuuMNm Competition: low
Member since: 08 January 2011 Total points: 1,449 (Level 3) Add Contact Block Best Answer - Chosen by Voters There are 46 chromosomes per cell in the human body
Why must gametes have the haploid number (23) of chromosomes, rather then the diploid number (46)? - Yahoo!7 Answers
http://au.answers.yahoo.com/question/index?qid=20090313073224AA6HyuZ Competition: low
thanks 5 years ago Report Abuse by kt Member since: 13 December 2006 Total points: 30,606 (Level 7) Add Contact Block Best Answer - Chosen by Voters Because gametes are eggs and sperm, which unite to form a zygote. Like;in case of syndromes individuals with extra chromosome or reduced chromosome numbers individuals are unable to survive and if they survive they are not normal
But a counter argument published in PNAS, asserts that the shared DNA found in both modern humans and our Neanderthal cousins may have come from common African ancestors. Without meaning to get all People magazine on you, the question about whether modern humans and Neanderthals hooked up has again become a subject of scientific debate
Sandwalk: The Genetics of Eye Color
http://sandwalk.blogspot.com/2007/02/genetics-of-eye-color.html Competition: lowIf a person has always had two different colored eyes, then this is called congenital heterochromia and is cause by a difference in the early stages of development of the iris. So Mum has genes Bb will give each child either the brown eye gene or the blue eye gene and Dad has gene Gb so he will give each child either the green eye gene or the blue eye gene.Children will inherit the following combinations Bb - Brown eyesGb - Green eyesbb - Blue eyesBG - this is an interesting one likely to be Brown, dominant over green or a very dark green.As I have said in a previous post; there are more genes than this involved so it is a lot more complicated so there are a lot more variations but this does give an example of how one gene can cause 4 variations
The cell's nucleus primarily contains chromosomes, in addition to the nucleolus and protein particles, that are organized in pairs of sequences that replicate (duplicate) during cellular reproduction. The sex cells are produced through meiosis, a process which adds another step to the cell reproduction cycle so that the chromosome pairs are split, enabling sex cells to combine later during fertilization
Sex - Simple English Wikipedia, the free encyclopedia
Because genetic sex determination is controlled by a pair of sex chromosomes (or by the presence or absence of one of the chromosomes), there are usually the same number of male and female offspring
homologous chromosomes A pair of chromosomes in the same individual that carry the same type of information (eye color) but not necessarily the same alleles (blue or brown). At At at at AT AATt AATt AaTt AaTt AT AATt AATt AaTt AaTt At AAtt AAtt Aatt Aatt At AAtt AAtt Aatt Aatt recessive An allele which must be homozygous for it's effect to be observed
Human Evolution Timeline in Bible Quotes
Parallelism between Adam's rib and science - There is an amazing coincidence between the numbers in the Bible involving creationism and numbers in science regarding man's evolution from the ape. In a nutshell, this is what we have: *Number of ribs in the human being: 24 *Number of chromosomes in the chimp's gametes: 24 *Creation: removal of one rib
Chromosomes and Sex
The zygote is diploid, meaning that it contains two sets of chromosomes.Sex Chromosomes X-Y:The male gametes or sperm cells in humans and other mammals are heterogametic and contain one of two types of sex chromosomes. If a sperm cell containing no sex chromosome fertilizes an egg, the resulting zygote will be XO or male.Sex Chromosomes Z-W:Birds, insects like butterflies, frogs and some species of fish have a different system for determining gender
How then was it propagated from one individual to his or her offspring and eventually to every human? Chromosomal rearrangements of this nature are not easily passed to offspring. Miller and a host of evolutionists have jumped on this alleged chromosomal fusion as evidence that humans, the chimpanzee, and other hominids all descended from one common ancestor
Chromosome Abnormalities Fact Sheet
An example of a condition caused by numerical abnormalities is Down Syndrome, also known as Trisomy 21 (an individual with Down Syndrome has three copies of chromosome 21, rather than two). One set of 23 chromosomes is inherited from the biological mother (from the egg), and the other set is inherited from the biological father (from the sperm)
Chromosomes in cells - Human Molecular Genetics - NCBI Bookshelf
At the early stages of development, individual cells in the embryo are totipotent: each cell retains the capacity to differentiate into all the different types of cell in the body. Other cells (often distinguished by the suffix -blast , as in osteoblasts, chondroblasts, myoblasts, etc.) divide actively and act as precursors of terminally differentiated cells
Chromosome - Wikipedia, the free encyclopedia
Compaction of the duplicated chromosomes during mitosis and meiosis results in the classic four-arm structure (pictured to the right) if the centromere is located in the middle of the chromosome or a two-arm structure if the centromere is located near one of the ends. In the nuclear chromosomes of eukaryotes, the uncondensed DNA exists in a semi-ordered structure, where it is wrapped around histones (structural proteins), forming a composite material called chromatin
(See Irving and Kischer, The Human Development Hoax: Time To Tell The Truth!, for extensive details and references.) But it roughly goes back to at least 1979 in the bioethics writings of Jesuit theologian Richard McCormick in his work with the Ethics Advisory Board to the United States Department of Health, Education and Welfare,18 and those of frog developmental biologist Dr. Clifford Grobstein in a 1979 article in Scientific American,19 and most notably in his classic book, Science and the Unborn: Choosing Human Futures (1988).20 Both McCormick and Grobstein subsequently continued propagating this scientific myth as members of the Ethics Committee of the American Fertility Society, and in numerous influential bioethics articles, leading to its common use in bioethics, theological, and public policy literature to this day
Each of these cultures can be subjected to a different drug, thus enabling doctors to find the right drug sooner, while it may still be of help, and without needlessly subjecting the person to many kinds of toxic chemicals. The nuclear envelope has totally disintegrated and the polar fibers have reached the centromeres of the chromosomes and have begun interacting with them
Gamete - Wikipedia, the free encyclopedia
This mutation, recombination, and the fact that the two chromosome sets ultimately come from either a grandmother or a grandfather on each parental side account for the genetic dissimilarity of siblings. The male haploid is pollen and is produced by the anther, when pollen lands on a mature stigma (botany) of a flower if grows a pollen tube down into the flower
How many chromosomes are in a human gamete
How many chromosomes in human gamete? 23, there are 23 chromosomes in human gametes How many chromosomes does a human gamete have after meiosis? 23 How many chromosomes are in a female human gamete? There are 23 chromosomes in a female human gamete
How many chromosomes do human body cells have
How many chromosomes are in the nucleus of human body cells? 46 How many chromosomes are present in a normal human body cell? There are 46 chromosome in the human body cell.23 each from mom and dad A typical human body cell has how many chromosomes? 46 How many chromosomes in the human body? There are 46 chromosomes. Improve Answer History Related Answers: How many chromosomes do human body cells have? 46 Chromosomes in the Human body cells.Body cells have "pairs" of chromosomes while sex cells have o How many pairs of chromosomes are found in human body cells? There are 23 pairs or 46 individual chromosomes in a humans cells
Within each parent (the mother or the father), the chromosomes in the germ cells intertwine and parts cross over from one chromosome to another in the pair. No, every body has not a single DNA molecule but at least 46 DNA molecules (and not 23 because as I explained the DNA molecules of two homologous chromosomes are not the same) in the nucleus of each cell
Member since: 08 January 2011 Total points: 1,449 (Level 3) Add Contact Block Best Answer - Chosen by Voters There are 46 chromosomes per cell in the human body
Why must gametes have the haploid number (23) of chromosomes, rather then the diploid number (46)? - Yahoo!7 Answers
thanks 5 years ago Report Abuse by kt Member since: 13 December 2006 Total points: 30,606 (Level 7) Add Contact Block Best Answer - Chosen by Voters Because gametes are eggs and sperm, which unite to form a zygote. Like;in case of syndromes individuals with extra chromosome or reduced chromosome numbers individuals are unable to survive and if they survive they are not normal
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