You have been given a virgin Drosophila female. You notice that the bristles on her thorax are much shorter than normal. You mate her with a normal male (with long bristles) and obtain the following F1 progeny1 3 short-bristled females, 1 3 long-bristled females, and 1 3 long-bristled males. A cross of the F1 long-bristled females with their brothers gives only long-bristled F2. A cross of short-bristled females with their brothers gives 1 3 short-bristled females, 1 3 long-bristled females, and 1 3 long-bristled males. Provide a genetic hypothesis to account for all these results, showing genotypes in every cross.

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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You have been given a virgin Drosophila female. You
notice that the bristles on her thorax are much shorter
than normal. You mate her with a normal male (with
long bristles) and obtain the following F1 progeny1
3 short-bristled females, 1
3 long-bristled females, and 1
3 long-bristled males. A cross of the F1 long-bristled females with their brothers gives only long-bristled F2.
A cross of short-bristled females with their brothers gives
1
3 short-bristled females, 1
3 long-bristled females, and 1
3 long-bristled males. Provide a genetic hypothesis to
account for all these results, showing genotypes in every
cross.

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