n Drosophila, an X-linked recessive allele produces yellow body color. The cross

Question

n Drosophila, an X-linked recessive allele produces yellow body color. The cross of a yellow female and a male with wild-type body color usually produces wild-type females and yellow males. Occasionally however, a yellow female is produced.
Explain how the unusual female is produced.

Explain how the unusual female is produced.

A) It happens when nondisjunction in the male parent produces an egg with two X and Y chromosomes. The XXY zygote will develop as female and will be homozygous for the recessive yellow-body allele.
B) It happens when crossover occurs between homologous male chromosomes.
C) It happens when nondisjunction in the female parent produces an egg with two X chromosomes. The XXY zygote will develop as female and will be homozygous for the recessive yellow-body allele.
D) None of the above

Explanation / Answer

C) It happens when nondisjunction in the female parent produces an egg with two X chromosomes. The XXY zygote will develop as female and will be homozygous for the recessive yellow-body allele.

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