Sex-linked traits question

Discussion of all aspects of cellular structure, physiology and communication.

Moderators: honeev, Leonid, amiradm, BioTeam

Post Reply
maccha
Garter
Garter
Posts: 12
Joined: Sat Oct 10, 2009 6:12 pm

Sex-linked traits question

Post by maccha » Sun Feb 28, 2010 8:58 pm

In biology we've been learning about how females must be homozygous for a sex-linked recessive trait in order for it to be expressed, since they have two X chromosomes. Then, though, we learned about Barr bodies and how one X chromosome generally gets inactivated.. How can you say a female is heterozygous, etc., or needs to be homozygous recessive if one chromosome is getting turned off anyways? For ex., the example always given of drosophila.. how females must be homozygous for white eyes in order to have white eyes.. what if they're heterozygous and one "red eye" trait gets turned off?

Post Reply

Who is online

Users browsing this forum: No registered users and 11 guests