help me!!!

Genetics as it applies to evolution, molecular biology, and medical aspects.

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help me!!!

Post by bsk89 » Tue Dec 23, 2008 8:03 pm

in drosophila, the mutation for ebony body color is recessive and autosomal (e), and the white eyed mutation is recessive and X-linked. Determine the phenotype and phenotypic ratios of the F1 and F2 generations for the following;
a)white eyed, ebony bodied female x pure breeding wild type male
b)reciprocal cross

i am helpless, i cannot figure out what the results should be! i beg, please someone help me!!! :oops:

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Post by GreenDog » Wed Dec 31, 2008 9:05 am

Just because i like answering this type of questions:
a)the cross is female white eye X linked: Xw Xw male XW 0
ebony autosomal Ae Ae AE AE

now draw the table to get all F1 progeny, divide to male an female: the females will be red eyed and brown, and the males white eyed and brown. F2 is a bit more work.
The only thing you have to do is write the crosses and then list all the possibilities, not interesting and not complicated.
"When In Danger Or In Doubt Run In Circles Scream And Shout"
Lawrence J. Peter

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