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Question

A person who is said to be heterozygous has ___.


  1. Two dominant alleles                                                          

  2. One dominant allele and one recessive allele                           

  3. Two recessive alleles

  4. One dominant trait and one recessive trait


Solution

The correct option is B

One dominant allele and one recessive allele                           


Each gene has alternative forms, called alleles. The allele which is expressed is called the dominant allele. The other one is the recessive allele which in the presence of the dominant allele does not express. Heterozygous individuals have one dominant and one recessive allele whereas homozygous individuals would have two alleles of the same type, i.e., either both dominant or both recessive. The recessive trait is expressed only in the homozygous condition, that is in the absence of the dominant trait.

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