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Question
Explain the mechanism of sex determination in birds.
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Solution
- In birds, the chromosomal mechanism of sex determination is ZW-ZZ type.
- In this type females are heterogametic and produce two types of eggs; 50% of eggs carry Z-chromosome, while 50% of eggs carry W- chromosome.
- Males are homogametic and produce one type of sperms. Each sperm carries a Z chromosome.
- Thus, the sex of an individual depends on the kind of egg (ova) fertilized by the sperm.
RELATED QUESTIONS
A zygote which has inherited an X chromosome from the father will develop into :
(a) baby boy
(b) baby girl
(c) adult
(d) either boy or girl
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ii. If sperm containing X chromosome fertilizes ovum, then diploid zygote is formed, that grows into a female child.
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Which pair of sex chromosome will determine a male?
