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Author Topic:   Introduction to Genetics
jar
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Posts: 33957
From: Texas!!
Joined: 04-20-2004
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Message 19 of 236 (678813)
11-10-2012 5:17 PM
Reply to: Message 17 by Faith
11-10-2012 4:57 PM


Re: QUESTION ONE: Species ID / CHROMOSOMES
Faith writes:

You are saying that all individuals of a species have the same number of chromosomes, but didn't someone here say that even within a species some individuals may have a different number? Ignore this if I got that wrong. I didn't review the whole thread.

Hi Faith, glad you are back.

Yes, even within a species it is possible for an individual to have more or less chromosomes. See The 44 Chromosome man.

It's unusual though.

Another great example is that one of the things that makes humans different than our cousins the other primates is that at sometime in the past in an even earlier primate two chromosomes fused together to make one chromosome so that humans only have 23 Chromosomes while our cousins the chimps, orangutans, bonobos and gorillas have 24.

Since each individual has two copies that means the normal human has 46, our cousins have 48 and the person in the link above has only 44.

You can read more on the fused chromosome in the article on human chromosome 2 at Wikipedia.


Anyone so limited that they can only spell a word one way is severely handicapped!

This message is a reply to:
 Message 17 by Faith, posted 11-10-2012 4:57 PM Faith has taken no action

  
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