Question

Select the incorrect statement.
A. Male fruit fly is heterogametic
B. In male grasshoppers 50% of sperms have no sex chromosome
C. In domesticated fowls, sex of progeny depends on the type of sperm rather than egg
D. Human males have one of their sex chromosome much shorter than the other

Answer 1

Hint: The development of male or female depends on the gametes that are fertilizing. There are two conditions present in nature it may depend on the male parent, i.e., male heterogamety while if it depends on the female parent, i.e., female heterogamety.

Complete answer: Sex determination is the process of knowing the sex of the progeny. It takes place due to parental heterogeneity. The gamete fusing with each other decides the sex of the child.
Option A: Male fruit fly is heterogametic: Male fruit fly has an XY sex chromosome. They produce two types of gametes, so are called heterogametic.
Option B: In male grasshoppers, 50% of sperms have no sex chromosome: Grasshoppers are XX-XO system where males are XO and females are XX. So in males, half will have an X chromosome and the rest will not have while all the female gametes will have the X chromosome.
Option C: In domesticated fowls, the sex of progeny depends on the type of sperm rather than an egg: The domesticated female fowls are heterogametic having ZW sex chromosomes. The male is homogametic so the sex of progeny depends on the egg rather than sperm.
Option D: Human males have one of their sex chromosome much shorter than the other: Human males have X and Y chromosomes which are responsible for the sex of the child. The Y sex chromosome is shorter than the X.
So the answer is option C: In domesticated fowls, sex of progeny depends on the type of sperm rather than egg

Note: The birds have sex determination - ZZ-ZW, i.e., ZZ is male which is homogametic whereas ZW is female which is heterogametic. So, the female gametes decide the sex of the offspring. The total number of chromosomes remains the same in both males and females. The fowls are birds so follow the same pattern.