Biology - Principles of Inheritance and Variation Question with Solution | TestHub

In birds, the sex determination mechanism is of the ZW type.

Males are homogametic and have the ZZ sex chromosome constitution, producing only one type of sperm carrying the Z chromosome.

Females are heterogametic and have the ZW sex chromosome constitution, producing two types of eggs: one carrying the Z chromosome and the other carrying the W chromosome.

Since the sperm always carries a Z chromosome, the sex of the offspring is determined by the type of egg (Z or W) that is fertilized by the sperm.

Answer: The sex of an individual depends on the type of egg fertilized by the sperm.