Wild-type Drosophila melanogaster have a brown/grey body color. Mutants exist th
ID: 35658 • Letter: W
Question
Wild-type Drosophila melanogaster have a brown/grey body color. Mutants exist that have a yellow body color. Several crosses were performed between phenotypically wild-type and yellow individuals, and the results of each cross are reported in the table below.
Deduce the mode of inheritance of the yellow body phenotype and genotypes of the parents and offspring in the following crosses.
Parents
Female progeny
Male progeny
Female
Male
Wild type
Yellow
Wild type
Yellow
A
Wild type
Yellow
198
0
203
0
B
Yellow
Yellow
0
156
0
145
C
Yellow
Wild type
210
0
0
190
D
Wild type
yellow
102
98
99
97
Parents
Female progeny
Male progeny
Female
Male
Wild type
Yellow
Wild type
Yellow
A
Wild type
Yellow
198
0
203
0
B
Yellow
Yellow
0
156
0
145
C
Yellow
Wild type
210
0
0
190
D
Wild type
yellow
102
98
99
97
Explanation / Answer
The mode of inheritance of yellow body phenotype from the above results can be deduced as X- linked recessive.
Taking into account that the trait for yellow colour (y) is recessive to grey/brown (y+).
The genotypes of the parents will be:
A. Wild type female (Xy+ Xy+) and yellow male (Xy Y)
B. Yellow Female ( Xy Xy) and yellow male (Xy Y)
C. Yellow Female ( Xy Xy) and wild type male (Xy+ Y)
D. Wild type female (Xy+ Xy) and yellow male (Xy Y)
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