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X chromosome

X chromosome

(Science: genetics) A sex chromosome. In mammals paired in females (XX), in amphibia paired in males. The sex chromosome that is present in both sexes: singly in males and doubly in females; human females normally have two X chromosomes.One of the sex chromosomes found in both sexes. The X chromosome in males can express many dominant sex-linked traits because the shorter opposing Y-chromosome has no homologous genes to challenge the dominance of some genes on the Y chromosome.


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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: 2
Views: 691

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: 209

Chromatin

I am all for skipping the mitochondrial chromosome for now:) Thank you for your explanation...it really helps:)

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by Hannamerika
Thu Sep 04, 2014 10:13 pm
 
Forum: Genetics
Topic: Chromatin
Replies: 2
Views: 883

Re: Chromatin

Before replication there were 23 pairs of molecules, 23 of maternal origin and 23 of paternal origin, plus the maternally-contributed mitochondrial chromosome (which I'll ignore for the rest of this post). Counting chromosomal centromeres, there are 46 centromeres total. After replication there ...

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by jonmoulton
Thu Sep 04, 2014 3:04 pm
 
Forum: Genetics
Topic: Chromatin
Replies: 2
Views: 883

Chromatin

... cell for it to replicate. Is that correct? That way once the chromatin replicates and does all of it's twisting and coiling, we then have our 23 chromosome pairs. Yes?

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by Hannamerika
Thu Sep 04, 2014 9:12 am
 
Forum: Genetics
Topic: Chromatin
Replies: 2
Views: 883
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