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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.
Both father and mother have the genes Ee in their cells. What colour are their eyes?
Choose the correct answer:
Chromosomes identical in male and female are called __________
Short Answer Question.
“Father is responsible for determination of sex of child and not the mother”. Justify.
Number of autosomes present in liver cells of a human female is ______.
A trait in an organism is influenced by
Select the statements that describe characteristics of genes
- genes are specific sequence of bases in a DNA molecule
- a gene does not code for proteins
- in individuals of a given species, a specific gene is located on a particular chromosome
- each chromosome has only one gene
Fill the blank circles in figure and identify the sex of child A and B.
In the ZW–ZZ sex determination system, which sex is heterogametic?
In the haplodiploidy system observed in honeybees, unfertilized eggs develop into which type of individual?
