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प्रश्न
Explain the mechanism of 'sex determination' in birds. How does it differ from that of human beings?
थोडक्यात उत्तर
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उत्तर
- The sex chromosomes in birds are determined as Z and W. The male is homomorphic (ZZ) and the female is heteromorphic (ZW).
- W chromosome carries female sex-determining genes and duplication of Z chromosome indicates male sex.
- So, in case of chicks, the sex is determined by the egg and not by the sperms.
- The difference between sex mechanisms of humans.
- birds is that the male is homomorphic (ZZ) and the female is heteromorphic (ZW) in birds, whereas the male is heteromorphic (XY) and female is homomorphic (XX) in humans.
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संबंधित प्रश्न
The number of pair(s) of sex chromosomes in the zygote of humans is ______.
Both father and mother have the genes Ee in their cells. What colour are their eyes?
Define the following:
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Define the following:
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Explain the mechanism of sex determination in birds.
Which of the following is incorrect regarding ZW-ZZ type of sex determination?
In human males all the chromosomes are paired perfectly except one. This/these unpaired chromosomes is/are ______.
- large chromosome
- small chromosome
- Y-chromosome
- X-chromosome
The maleness of a child is determined by
Which of the following statements is not true with respect to variation?
