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प्रश्न
Explain the mechanism of 'sex determination' in birds. How does it differ from that of human beings?
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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
Which of the two, sperm or ovum, decides the sex of the child?
The number of pair(s) of sex chromosomes in the zygote of humans is :
(a) one
(b) two
(c) three
(d) four
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
A couple with a newborn baby is troubled that the child does not resemble either of them. Suspecting that a mixup occurred at the hospital, they check the blood type of the infant. It is type O. Because the father is type A and the mother type B, they conclude that a mixup has definitely occurred. Are they correct? Give reason for your answer.
Choose the correct answer :
Human sex chromosomes are __________
Give Technical Term:
The cell which determines the sex of a baby.
ZW-ZZ system of sex determination occurs in
Female heterogamy is shown by
Also describe as to, who determines the sex of an unborn child? Mention whether temperature has a role in sex determination.
Twins are born to a family that lives next door to you. The twins are a boy and a girl. Which of the following must be true?
