In a Drosophila experiment, a cross was made between homozygous wild-type females and yellow-bodied males. All of the resulting F 1 s were phenotypically wild type. However, adult flies of the F 2 generation (resulting from matings of the F 1 s) had the characteristics shown in the figure.
- How is the mutant allele for yellow body inherited?
A) It is recessive.
B) It is codominant.
C) It is dominant.
D) It is incompletely dominant.

Question

In a Drosophila experiment, a cross was made between homozygous wild-type females and yellow-bodied males. All of the resulting F 1 s were phenotypically wild type. However, adult flies of the F 2 generation (resulting from matings of the F 1 s) had the characteristics shown in the figure. 
- How is the mutant allele for yellow body inherited?
A) It is recessive. 
B) It is codominant. 
C) It is dominant. 
D) It is incompletely dominant.

Quizplus · Accepted Answer

The mutant allele for yellow body is recessive, meaning that it must be present on both copies of the gene in order to be expressed.

In a Drosophila Experiment, a Cross Was Made Between Homozygous