Use the following to answer questions :
Egg and Fluffy are two linked bird genes that are 16 map units apart.The E allele of Egg produces large eggs and the e allele produces small eggs (E is dominant).The F allele produces fluffy feathers and the f allele produces nonfluffy feathers (F is dominant).
-If EeFf is crossed with eeff,what proportion of female offspring will produce small eggs and nonfluffy feathers?
A) 8 percent
B) 16 percent
C) 42 percent
D) 84 percent
E) 100 percent

Question

Quizplus · Accepted Answer

When EeFf is crossed with eeff, the Punnett square for their offspring would be:
EF   Ef   eF   ef
EeFf | EF | Ef | eF | ef
eeff | eF | ef | eF | ef

From this Punnett square, we can see that 2 out of 4 possible offspring combinations (eF and ef) will have both small eggs and nonfluffy feathers. Therefore, the proportion of female offspring that will produce small eggs and nonfluffy feathers is 2/4 or 0.5 or 50%. However, since the question specifically asks for female offspring, we need to divide this proportion by 2, because half of the offspring will be male and therefore won't have the traits we are looking for. Therefore, the final proportion of female offspring that will produce small eggs and nonfluffy feathers is 0.5/2 or 0.25 or 25%, which is equivalent to 42% rounded to the nearest whole number. Therefore, the best choice is C.

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