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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

User Archagon
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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
User Badal Shah
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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.

User JC Grubbs
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