Zoology - Principles of Inheritance and Variation Question with Solution | TestHub
Which of the following statements is/are correct for a polygenic inheritance?
1. They show uniformity.
2. Controlled by three or more genes.
3. It is not influenced by the environment.
4. In polygenic inheritance, phenotype reflects the contribution of recessive allele only.
Options:
Answer:
Solution:
When traits are controlled by three or more genes, they are called polygenic traits and their inheritance is called as polygenic inheritance. Human skin colour is a classic example following polygenic inheritance as the skin colour is regulated by three pairs of gene. Polygenic inheritance is influenced by the environment as well and not just the polygenes. In this inheritance, the phenotype reflects the contribution of each allele and not only the dominant ones. The effect of each allele is additive and donot show uniformity.
