A white eyed female drosophila fly is crossed with a sepia eyed male drosophila

Question

A white eyed female drosophila fly is crossed with a sepia eyed male drosophila fly. 1) Give the expected phenotype and genotype of the F1 flies. 2) what are the expected F2 phenotypic and genotypic ratio expected. Y crossing the F1 males and females. A white eyed female drosophila fly is crossed with a sepia eyed male drosophila fly. 1) Give the expected phenotype and genotype of the F1 flies. 2) what are the expected F2 phenotypic and genotypic ratio expected. Y crossing the F1 males and females. 1) Give the expected phenotype and genotype of the F1 flies. 2) what are the expected F2 phenotypic and genotypic ratio expected. Y crossing the F1 males and females.

Explanation / Answer

Consider the symbols 'w' for white eyes and 's' for sepia eyes. Since, eye color genes are found on sex chromosome (X chromosome) of drosophila fly, the female fly is designated Xw/Xw and male fly is designated Xs/Y

1)

Punnet square:

F1 genotype: 1/2 Xw/Xs; 1/2 Xw/Y

F1 phenotype: Half sepia colored female; half white colored male

2)

F2 genotype: 1/4 Xw/Xw; 1/4 Xw/Xs; 1/4 Xw/Y; 1/4 Xs/Y

F2 phenotype: 1/4 white colored female; 1/4 sepia colored female; 1/4 white colored male; 1/4 sepia colored male

Parental generation Parent 1 (female) Parent 2 (male) Parental phenotype White eyes Sepia eyes Parental genotype Xw/Xw Xs/Y

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

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