Question

With respect to Sex determination pattern in Birds which of the following statement is true?

• A. Females are homogametic.
• B. Males are heterogametic.
• C. The sex of an individual depends on the type of egg fertilized by the sperm.
• D. The sex of an individual depends on the type of sperm that fertilizes the egg.

Hint:

Birds follow ZW-ZZ, so the female is heterogametic and the egg decides the sex.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept
Birds follow the ZW-ZZ type of sex determination.

Step 2: Analyse
The male is ZZ (homogametic), so all sperms carry Z.
The female is ZW (heterogametic) and forms Z and W eggs.
A Z egg gives a ZZ male and a W egg gives a ZW female.

Step 3: Conclusion
The sex of the offspring depends on the type of egg fertilised by the sperm.

Final Answer:
In birds the sex depends on the type of egg that is fertilised. \[ \boxed{\text{(C) }\text{The sex of an individual depends on the type of egg fertilized by the sperm.}} \]