Question

A family has two male children one brother has a straight thumb a straight thumb while the other brother has a bent thumb what causes this difference

Answer 1

This thing does back to their pedigree which mostly comes from their parents so one of the parents has a bent thumb and the other has a straight thumb

Answer 2

Answer: Due to different alleles.

Step-by-step explanation:

• Every trait is encoded by a particular gene and each gene has various alternative forms. These alternative forms of a given gene are known as alleles.

• The alleles that encode the shape of the thumb are of two types - one is the S allele which encodes a straight thumb and is dominant in nature whereas the second allele is the h allele which encodes for the bent thumb and is recessive in nature.

• Thus, the two children have different thumbs as they have received different alleles from their parents.