Given below are two statements.
Statement I : Homozygous ZZ karyotype determines female sex in birds.
Statement II : ZO karyotype determines male sex in birds.
In light of the above statements, choose the correct answer from the options given below.

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Both statement I and statement II are correct.

Both statement I and statement II are incorrect.

Statement I is correct but statement II is incorrect.

Statement I is incorrect but statement II is correct.

answer is B.

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Detailed Solution

Heterozygous ZW determines female sex in birds.

Statement I incorrectly states that homozygous ZZ determines female sex in birds. In birds, the heterogametic sex (the one with different sex chromosomes) is female, and the homogametic sex (the one with identical sex chromosomes) is male. Female birds typically have a ZW chromosome configuration, while males have a ZZ chromosome configuration. Therefore, it is the presence of a single Z chromosome (in ZW configuration) that determines female sex in birds, not homozygous ZZ.

Statement II incorrectly states that ZO determines male sex in birds. ZZ determines male sex in birds.

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