Normally, sex of offspring in birds depends on

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environmental conditions

type of sperm fertilising an ovum

hormonal conditions

type of ovum fertilised by a sperm

answer is B.

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Detailed Solution

Sex determination mechanism in the birds depends on type of ovum fertilised by a sperm.

Females (ZW): Female birds have a pair of sex chromosomes called Z and W (ZW). They contribute an egg with one of these sex chromosomes to the offspring.
Males (ZZ): Male birds, on the other hand, have two Z sex chromosomes (ZZ). They contribute a sperm with one of these Z chromosomes to the offspring.

The sex of the offspring is determined by which type of sex chromosome combination is produced during fertilisation:

ZZ Zygote: If a sperm carrying a Z chromosome fertilises an egg with a Z chromosome (ZZ), the offspring will develop into a male (ZZ).
ZW Zygote: If a sperm carrying a Z chromosome fertilises an egg with a W chromosome (ZW), the offspring will develop into a female (ZW).

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