Advertisements
Advertisements
Question
Explain the mechanism of 'sex determination' in birds. How does it differ from that of human beings?
Advertisements
Solution
- 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.
APPEARS IN
RELATED QUESTIONS
Fill in the following blank with suitable word :
Genes always work in ................ .
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
Name two animals which have nineteen pairs of chromosomes.
Does the sex of the child depend on the father or it is just a matter of chance? Discuss.
Why did T. H. Morgan select Drosophila melanogaster to study sex linked genes for his lab experiments ?
Choose the correct answer:
Males have more chances of suffering from sex-linked disease because of ___________
Explain the mode of sex determination in honeybees.
The number of pairs of sex chromosomes in the zygote of a human being is ______
Human offspring’s sex is determined ______
