Question

Which of the following is correct about $ZW-ZZ$ type of sex determination in birds?

• A. Males are heterogametic
• B. Females are heterogametic
• C. Females are homogametic
• D. Both males and females are homogametic

Answer 1

Answer: (B)

In $ZW-ZZ$ mechanism, female carries one $\text{Z and one W}$ chromosome, thus females form two types of gametes, $\text{50\% with Z and 50\% }$ with $W$ chromosomes.