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Y chromosome

Y chromosome

(Science: genetics) The small chromosome that is male-determining in most mammal species and found only in the heterogametic sex. Thus in mammals the male has one y chromosome and one x chromosome. One region of the y chromosome, the pseudoautosomal region, is homologous to and pairs with the x chromosome. The primary determinant of male sexual development is found on the unpaired, differentiated segment of the y chromosome. It carries few other genes besides those dictating sperm development and triggering appropriate hormonal output. The sex chromosome that is carried by men; human males normally have one x chromosome and one Y chromosome.One of the sex chromosomes that has the genetic information to produce male offspring, that is accompanied by chromosome X. Some inherited characteristics in offspring (such as hairy ears and colour blindness in men) are believed to be sex linked, I.e. in.


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Re: Evolution of the Face and Head

... with A could mate with a B mutant. Some of their offspring could have both mutations. In an example where these 2 mutations lie on the same chromosome at different loci, I understand that through recombination these mutant alleles can be combined onto one chromosome. Thus lots of offspring ...

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by Draco02
Wed Mar 25, 2015 12:03 pm
 
Forum: Evolution
Topic: Evolution of the Face and Head
Replies: 5
Views: 5246

I have got some BIG issues! forgive the long post

... free to tell me something about the HLA systems Here is the manual notes from my School babes! BLOOD GROUP SYSTEMS ABO The ABO genes reside on the chromosome 9 (Bernstein’s theory). The blood groups A and B are further subdivided into subgroups, with A being in a form A1 or A2 (A1 is dominant to ...

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by saddy51
Sun Jan 04, 2015 10:39 am
 
Forum: Genetics
Topic: I have got some BIG issues! forgive the long post
Replies: 1
Views: 1775

Re: Mitochondrial DNA

There are genetic diseases caused by defects carried on the mitochondrial chromosome that can have clear phenotypic consequences. http://www.umdf.org/site/c.8qKOJ0MvF7LUG/b.7934627/k.3711/What_is_Mitochondrial_Disease.htm But a quick ...

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by wildfunguy
Wed Nov 19, 2014 8:18 pm
 
Forum: Genetics
Topic: Mitochondrial DNA
Replies: 6
Views: 3785

Re: Mitochondrial DNA

There are genetic diseases caused by defects carried on the mitochondrial chromosome that can have clear phenotypic consequences. http://www.umdf.org/site/c.8qKOJ0MvF7LUG/b.7934627/k.3711/What_is_Mitochondrial_Disease.htm

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by jonmoulton
Mon Sep 08, 2014 5:23 pm
 
Forum: Genetics
Topic: Mitochondrial DNA
Replies: 6
Views: 3785

Colorblindness Probability Help!

The incidence of an XXY karyotype is about 1 in every 1000 male births, the extra X chromosome coming either from the mother's egg or the father's sperm by nondisjunction during meiosis. Suppose the baby's father has red-green colorblindness. Would you predict that ...

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by kaylagh
Sun Sep 07, 2014 6:07 am
 
Forum: Genetics
Topic: Colorblindness Probability Help!
Replies: 0
Views: 1412
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