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May 30, 2015

Homework Help: genetics

Posted by stew on Saturday, September 22, 2007 at 10:50pm.

1. The genes for mohogany eyes and ebony body are approximately 25 map units apart on chromosome III in Drosophila. Assume that a mahogany-eyed female was mated to an ebony-bodied male and the resulting F1 phenotypically wild type females were mated to mahogany, ebony males. Of 1000 offspring, what would be the expected phenotypes and in what numbers would they be expected?

2. Given that loci A and B in Drosophila are sex-linked and 20 map units apart, what phenotypic frequencies would you expect in male and female offspring resulting from the following crosses? (Assume A and B are dominant to a and b, respectively):
(a) AaBb(cis)female X ab/Y male
(b) AaBb(trans) X ab/Y male
(c) aabb female X AB/Y male

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