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Principles of Inheritance and Variation — BIOLOGY STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceBIOLOGYPrinciples of Inheritance and Variation3 Marks
Question
Describe sex-determination in birds with example.
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Answer

Sex chromosomes in birds are determined as Z and W. The male is homomorphic (ZZ) and the female is heteromorphic (ZW). The W-chromosome carries female sex-determining genes, and the duplication of Z-chromosomes indicates the male sex.

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