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Haploid chromosome number (view source)
Revision as of 20:20, March 25, 2017
, 20:20, March 25, 2017→Chromosomes
For example, look at four genes, each on different chromosomes. There is one for eye color, one for hair. We have two chromosomes, one for hair one for eyes. In the human case we have 23 homologous pairs in our normal cells. This means we are diploid, as there are in fact 46 chromosomes in each cell nucleus. The n for humans is n=23 because we have to divide by 2 since we are diploid.
For example, look at four genes, each on different chromosomes. There is one for eye color, one for hair. We have two chromosomes, one for hair one for eyes. In the human case we have 23 homologous pairs in our normal cells. This means we are diploid, as there are in fact 46 chromosomes in each cell nucleus. The n for humans is n=23 because we have to divide by 2 since we are diploid.
A classic consequence of having the wrong ploidy number is found in suffers of Down's Syndrome which have an extra chromosome 21 thereby making them trisomic for 21. This is also an example of aneuploidy, having a chromosome count that is different for the species. This can happen for instance during a non-disjunction event during meiosis.
A classic consequence of having the wrong ploidy number is found in suffers of Down's Syndrome which have an extra chromosome 21 thereby making them trisomic for 21. This is also an example of aneuploidy, having a chromosome count that is different for the species. This can happen for instance during a [[non-disjunction]] event during meiosis.
== Haploid ==
== Haploid ==