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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
If X chromosome is inherited from mother and Y from father, the offspring will be male.
Explain the mechanism of sex determination in birds.
In a human, how many chromosmes are present in a brain cell?
Which combination of genes in the zygote will produce children with brown eyes?
A family consists of two parents and their five children and the pedigree chart below shows the inheritance of the trait colour blindness in them.
Who is colour blind in the parents – the Father or the Mother?
Answer the following question:
How is sex determined in human beings? Explain with the help of a diagram.
Which of the following is incorrect regarding ZW-ZZ type of sex determination?
Distinguish between heterogametic and homogametic sex determination systems.
A woman has only daughters. Analyse the situation genetically and provide a suitable explanation.
Which of the following group shows ZW-ZZ type of sex determination?
