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
Write notes on sex determination in the unborn baby.
In a human, how many chromosmes are present in a sperm in the testes?
Does the sex of the child depend on the father or it is just a matter of chance? Discuss.
Choose the correct answer:
Males have more chances of suffering from sex-linked disease because of ___________
Complete the following sentence with appropriate word:
______are the alternative forms of a gene producing different effects.
Differentiate Intersexes from Supersexes.
Some dinosaurs had feathers although they could not fly but birds have feathers that help them to fly. In the context of evolution this means that
The chromosomal constitution of a human female can be written as ______
Does a male child inherit X chromosome from his father? Justify.
What is the probability of a girl or a boy being born into a family? Justify your answer.
