Question

Give the pair of sex chromosomes in male and female birds.

Answer 1

The first time sex chromosomes introduced by the Bridges in the year 1922 first time found in the drosophila. The sex of an individual is determined by a balance between the genes for maleness and femaleness present in the individual according to the sex chromosomes theory. And determine the sex expression by the balance of the genes on the autosomes chromosomes.

Complete answer:
Z and W are the Sex chromosomes designated into the birds’ male have two ZZ chromosomes called a homomorphic and female have ZW chromosomes known as the name heteromorphic type of chromosomes. Chromosomes which do not differentiate the morphology of the female and male known as the autosomes and chromosomes which differentiate the morphology number in the male and female called as the allosomes chromosomes.
There are four mechanism for the sex determination such as sex character, chromosomal sex determination, monogenic sex determination and environmental sex determination. In the birds Union of the Z sperm with ovum having Z chromosomes that obtained in the male or union Z sperm with the ovum and carrying W chromosomes leads to the development of female bird’s sex organ. In the case of diploid haploid sex system the honey bees the female have diploid 2n= 32 chromosomes and male have haploid n= 16 chromosomes.

Note: The process of the sex differentiation by the sex chromosomes that particular individual will develop into the male and female sex reproductive organs. Sex expression is defined by the genes and chromosomes that present in the unisexual animals and birds. There are two types’ sex chromosomes autosomes and allosomes.