In birds, the sex-determination mechanism is:

AXX-XO type

BZW type with female heterogamety (females ZW, males ZZ)

CHaplodiploid

DXY type with female heterogamety

Answer & Solution

Correct answer: B. ZW type with female heterogamety (females ZW, males ZZ)

**Birds:** **ZW type, female heterogamety**. Females are **ZW** (two different sex chromosomes), males are **ZZ** (homogametic). So in birds the **female determines the sex of the offspring**.

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