You are working with Drosophila, and cross females from a true-breeding strain with white eyes to...
You are working with Drosophila, and cross females from a
true-breeding strain with white
eyes to males from a true-breeding strain with red eyes. You
examine 200 offspring (100 males
and 100 females) from this cross. Which of the following matches
the expected outcome?
A) 100 red-eyed females, 100 red-eyed males
B) 100 red-eyed females, 100 white-eyed males
C) 50 red-eyed females, 50 white-eyed females, 50 red-eyed males,
50 white-eyed males
D) 100 red-eyed females, 50 red-eyed males, 50 white-eyed
males
Homework Answers
X' is gene for white and XR is for red eye.
True breeding white female is X'X' and true breeding red eye male is XRY.
So, cross between X'X' x XRY will give X'XR and X' Y.
Since XR is dominant over X', the ratio will be 1:1 red eyed female and L white eyed male.
So, the correct answer is option B that is 100 red eyed female and 100 white eyed male.
Add Answer to:
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