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प्रश्न
Explain the mechanism of sex determination in birds.
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उत्तर
- In birds, the chromosomal mechanism of sex determination is ZW-ZZ type.
- In this type females are heterogametic and produce two types of eggs; 50% of eggs carry Z-chromosome, while 50% of eggs carry W- chromosome.
- Males are homogametic and produce one type of sperms. Each sperm carries a Z chromosome.
- Thus, the sex of an individual depends on the kind of egg (ova) fertilized by the sperm.
संबंधित प्रश्न
Which of the following is an example of ZW – ZZ type of mechanism of sex determination?
There are ................ pairs of chromosomes in the human being.
Does genetic combination of mother play a significant role in determining the sex of a new born baby?
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 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
What is parthenogenesis?
Distinguish between heterogametic and homogametic sex determination systems.
A man with blood group A marries a woman having blood group O. What will be the blood group of the child?
The chromosomal constitution of a human female can be written as ______
Female heterogamy is shown by
