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प्रश्न
Explain the mechanism of 'sex determination' in birds. How does it differ from that of human beings?
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
What are the chromosomes XY and XX known as?
The sex of a child is determined by which of the following?
(a) the length of the mother's pregnancy
(b) the length of time between ovulation and copulation
(c) the presence of and X chromosome in an ovum
(d) the presence of a Y chromosome in a sperm
________ shows haplo-diploid type of sex-determination.
Explain the following terms:
Identical twins
Which of the following develops through parthenogene is?
The number of pairs of sex chromosomes in the zygote of a human being is ______
A man with blood group A marries a woman having blood group O. What will be the blood group of the child?
Which of the following is an example of genetic variation?
Human offspring’s sex is determined ______
Structures present in a cell which is responsible for determination of the sex of a baby is
