Background for Questions 1-4. Female Drosophila melanogaster that are homozygous

Question

Background for Questions 1-4. Female Drosophila melanogaster that are homozygous for the X-linked, recessive white eye allele and the autosomal, dominant normal wing shape allele are crossed with males that carry the X-linked, dominant red eye and autosomal recessive vestigial wing.

Please draw the punnnet squares out to explain!

1. What is the phenotype of the F1 females?

White eye, Normal wing

White eye, Vestigial wing

Red eye, Normal wing

Red eye, Vestigial wing

2. What is the phenotype of the F1 males?

White eye, Normal wing

White eye, Vestigial wing

Red eye, Normal wing

Red eye, Vestigial wing

Explanation / Answer

Female drosophilla is homozygous for x linked white eyed allele is crossed with x linked and recessive vestigeal wing

For F1 generation the females will be carrier for x linked gene with dominant vestigeal wings. because the x from the father will go to the female that will be red eyed and one form the mother and both of them will be having the x linked recessive white eye. so the offspring will be red eyed

but in F2 generation there will be both type of females , with white and red eyed but the sings will be red coloured because it is autosomal dominance .

Related Questions

Navigate

• Browse (All)
• Browse B
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.