Sex chromosomes of birds are

ZZ - ZW

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ZO - ZZ

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XX - XY

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XO - XX

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Solution

The correct option is A ZZ - ZW
Sex determination in birds is of ZW-ZZ types in which females are heteromorphic (ZW) and males have homomorphic sex chromosomes (ZZ).
Some insects (butterflies and moths) show ZO-ZZ type of sex determination wherein males are homogametic (ZZ) but the female carries only one sex chromosome (ZO).
Human follows XY-XX mechanisms of sex determination wherein male is heterogametic and carries “XY” sex chromosome while female carries two copies of X-chromosomes (XX) as its sex chromosomes.
In round worms and few insects (grasshopper), XX-XO mechanism of sex determination is present where females are homogametic (XX) but the male carries only one sex chromosome (XO).
So, the correct answer is 'ZZ - ZW'

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∣ ∣ ∣ ∣ \begin{matrix} ^{x} C_{1} & ^{x} C_{2} & ^{x} C_{3}^{y} C_{1} & ^{y} C_{2} & ^{y} C_{3}^{z} C_{1} & ^{z} C_{2} & ^{z} C_{3} \end{matrix} ∣ ∣ ∣ ∣

\frac{x y z}{k} (x - y) (y - z) (z - x)

k

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