Advertisements
Advertisements
प्रश्न
Explain the mechanism of sex determination in birds.
Advertisements
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
In a human, how many chromosmes are present in a sperm in the testes?
In a human, how many chromosmes are present in a fertilised egg?
A couple with a newborn baby is troubled that the child does not resemble either of them. Suspecting that a mixup occurred at the hospital, they check the blood type of the infant. It is type O. Because the father is type A and the mother type B, they conclude that a mixup has definitely occurred. Are they correct? Give reason for your answer.
Complete the following sentence with appropriate word:
______are the alternative forms of a gene producing different effects.
There are five daughters and no son in a family. It is because
Which of the following organisms has haploid number of chromosomes?
In XO type of sex determination ______.
A trait in an organism is influenced by
If a male grasshopper with XO genotype produces sperm, what proportion of his sperm will carry the X chromosome?
