Zoology - Principles of Inheritance and Variation Question with Solution | TestHub

A single gene can exhibit multiple phenotypic expression. Such a gene is called a pleiotropic gene. The inheritance of human height is polygenic inheritance. In birds, the total number of chromosome is same in both males and females. But two different types of gametes in terms of the sex chromosomes, are produced by females, i.e., female heterogamety. In humans, males are heterogamous. Turner's syndrome is caused due to the absence of one of the X chromosomes, i.e., they have 45 chromosomes with only one X chromosome. Trisomy is due to one extra chromosome and the number of chromosomes can be represented by$2\mathrm{n}+1.$