Question

In Drosophila, XXY represents a female but in human it is an abnormal male. It shows that

• A. Y-chromosome is essential for male sex in human.
• B. Y-chromosome is essential for female sex determination in Drosophila.
• C. Y-chromosome is not essential for male sex determination in human.
• D. All of the above

Answer 1

The correct option is A Y-chromosome is essential for male sex in human.

In Drosophila, XXY represents a female but in human it is an abnormal male, because Y chromosomes are essential for determining the sex of the individual. Normally male individual possess X and Y chromosomes and female have XX chromosomes. Therefore individual having XXY genotype is an abnormal male.