Biology class

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scastle
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Biology class

Post by scastle » Mon Dec 14, 2009 8:37 pm

In biology class the teacher has asked us about calico cats. He said, "Calico cats are almost always female. A male calico cat is usually sterile. Why is this?" I figured it was because the male calico has two x chromosomes along with y but I'm not exactly sure. Can someone help explain this to me so that I can have a better understanding?

kolean
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Post by kolean » Tue Dec 15, 2009 5:45 pm

Yes, you are right. The only way a male can be a calico is by having two X chromosomes and a Y (thus sterile). Seems that the gene for orange and black are located each on the X chromosome, and that the color for white is on a regular chromosome. Since females have 2 X chromosomes, they are able to express orange and black together, while the male with only one X chromosome can express only black OR orange.
Info from:
http://vetmedicine.about.com/od/catbree ... cocats.htm

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