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 brain cell?
Which combination of genes in the zygote will produce children with blue eyes?
Write a short note on sex determination in man.
Read the following statements and select the correct option.
i. If sperm containing Y chromosome fertilizes the ovum, then diploid zygote is formed that grows into a male child.
ii. If sperm containing X chromosome fertilizes ovum, then diploid zygote is formed, that grows into a female child.
There are five daughters and no son in a family. It is because
Chromosomal constitution of normal human females can be written as ______.
The number of pairs of sex chromosomes in the zygote of a human being is ______
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
What is sex determination? Explain the mechanism of sex determination in the case of birds.
