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Consider the following crosses involving grey (wild-type) and yellow body colour true breeding Drosophila:
| Cross | F1 progeny | F2 progeny | |
| Cross 1 | Grey female X yellow male | All males: grey All females: grey |
Grey females: 98 Yellow males: 45 Grey males: 49 |
| Cross 2 | Yellow females X grey males | All males: yellow All females: grey |
? |
Assuming 200 F2 offspring are produced in cross 2, which one of the following outcomes is expected?
97 grey males, 54 yellow females, 49 grey males.
102 yellow males, 46 yellow females, 52 grey females.
52 grey males, 49 yellow males, 48 yellow females, 51 grey females.
98 grey males, 94 yellow females, 2 yellow males, 6 grey females.
Answers (1)
In Cross 1 between a grey female and a yellow male, all the F1 progeny have grey body color, indicating that grey is dominant over yellow.
In Cross 2 between yellow females and grey males, if grey body colour is dominant, all the males would be expected to have yellow body colour, as observed in the F1 generation. However, all the females would be expected to have grey body colour.
Therefore, assuming 200 F2 offspring are produced in Cross 2, the expected outcome would be:
All males: yellow
All females: grey
In this scenario, there would be no grey males and no yellow females among the 200 F2 offspring. The expected outcome would be 200 yellow males and 200 grey females, with no grey males or yellow females.
The expected outcome you provided (52 grey males, 49 yellow males, 48 yellow females, 51 grey females) does not match the expected pattern based on the given information and the principle of dominance. Hence, the correct answer is option 3.
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