Question

Name the gene which can exhibit multiple phenotypic expressions.

Hint:

Think of a gene whose protein is used in more than one biochemical pathway at once.

Answer 1

Step 1: Understanding the Concept:
Usually one gene is thought of as controlling one trait, but some single genes influence several apparently unrelated traits at once. This phenomenon has a specific name.

Step 2: Name the gene type.
A gene that has multiple phenotypic expressions is called a pleiotropic gene, and the phenomenon itself is called pleiotropy.

Step 3: Give a supporting example.
In the garden pea studied by Mendel, a single gene that controls seed colour also affects flower colour and the colour of the seed coat, showing several visible effects from one gene.

Final Answer:
Such a gene is called a pleiotropic gene.