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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
The two versions of a trait (character) which are brought in by the male and female gametes are situated on :
(a) copies of the same chromosome
(b) sex chromosomes
(c) two different chromosomes
(d) any chromosomes
Which combination of genes in the zygote will produce children with brown eyes?
Define the following:
Sex chromosomes
How drones are produced in honey bees?
Differentiate Intersexes from Supersexes.
Match the items of Column I with Column II:
| Column I | Column II | ||
| i. | XX-XO method of Sex Determination | a. | Turner syndrome |
| ii. | XX-XY method of Sex Determination | b. | Female heterog ametic |
| iii. | karyotype-45 | c. | Grasshopper |
| iv. | ZW-ZZ method of Sex Determination | d. | Female homogametic |
Which of the following is incorrect regarding ZW - ZZ type of sex determination?
Also describe as to, who determines the sex of an unborn child? Mention whether temperature has a role in sex determination.
What is the probability of a girl or a boy being born into a family? Justify your answer.
What is sex determination? Explain the mechanism of sex determination in the case of birds.
