Question

Which of the following will have the highest number of eye facete?

(a) Ultra bar female Drosophila

(b) Heterozygous Bar male Drosophila

(c) Heterozygous Bar female Drosophila

(d) Homozygous bar Female

I had been asked this question by my school teacher while I was bunking the class.

My query is from Chromosomal Abnormalities : Duplication in chapter Chromosomal Basis of Inheritance of Cytogenetics

Answer 1

Correct answer is (c) Heterozygous Bar female Drosophila

For explanation I would say: The bar gene is present in the X chromosome, thus, males can’t have two copies for being homozygous or heterozygous. Ultra bar condition is most severe, then is the homozygous bar and then follows bar.