Question

Sex chromosomes of male birds are ......................

• A. XY
• B. ZW
• C. XX
• D. ZZ

Hint:

In birds, males have ZZ chromosomes and females have ZW chromosomes. This is different from mammals, where males have XY chromosomes.

Answer 1

The Correct Option is D

Step 1: Understanding sex chromosomes in birds.
In birds, the sex chromosomes are opposite of mammals. Male birds have ZZ chromosomes and female birds have ZW chromosomes.
Step 2: Analyzing the options.
(A) XY: Incorrect — This is the chromosomal pattern for males in mammals, not birds.
(B) ZW: Incorrect — This is the chromosomal pattern for females in birds.
(C) XX: Incorrect — This is the chromosomal pattern for females in mammals.
(D) ZZ: Correct — Male birds have ZZ chromosomes.
Step 3: Conclusion.
The correct answer is (D) ZZ, as male birds have ZZ chromosomes.