Question

Read the following and answer from given below:

According to Mendel, one gene controls the expression of one character only. The ability of a gene to have multiple phenotypic effects because it influences a number of characters are an exception. The gene has multiple phenotypic effects because its ability to control two or more characters can be seen in cotton. In cotton, a gene for the lint also influences the height of the plant, size of the ball, number of ovules, and viability of seeds.

Which of the following disorder is an example of genes with multiple phenotypic effects?

Options

• Phenylketonuria

• Haemophilia

• Sickle cell anaemia

• Both Phenylketonuria and Sickle cell anaemia.

Answer 1

Both Phenylketonuria and Sickle cell anaemia.

Explanation:

The ability of a gene to have multiple phenotypic effects because it influences a number of characters simultaneously is known as pleiotropy. In human beings pleiotropy is exhibited by syndromes, i.e., sickle cell anaemia and phenylketonuria.