Multiple choice

Raman is Rh positive. Which among the following best describes him?

  1. He is either homozygous dominant (DD) or heterozygous (Dd) for this trait.

  2. He will be homozygous dominant (DD).

  3. He will be homozygous recessive (dd).

  4. He may be either homozygous recessive (dd) or heterozygous (Dd) for this trait.
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A Correct answer
Explanation

The Rh blood factor is a dominant trait. Therefore, both homozygous dominant (DD) and heterozygous (Dd) people have Rh antigens on the surface of their red cells, which make them Rh positive.

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