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Left thumb over right is dominant, and is represented with a capital C. Right thumb over left is recessive, and is represented with a lowercase c.


What would be the genotype of a person who naturally crosses his right thumb over his left when folding his hands together?

A) cc

B) Cc

C) CC or cc

D) CC or Cc

Answer :

Answer: Option A) cc

Explanation:

  • For a given gene, there are 2 or more alternative forms present, and they are known as alleles.
  • The alleles are of two types - dominant and recessive.
  • The dominant allele is the one which expresses itself in both heterozygous and homozygous condition in the phenotype.
  • The recessive allele is the one which is only able to express itself in homozygous condition.
  • Since, the right thumb over left allele c is recessive, the person who crosses right thumb over left must be a homozygote, and hence his genotype should be cc.

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