Multiple choice

Kalpana is Rh positive. Which of the following best describes her condition?

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

  2. She is homozygous dominant (DD).

  3. She is homozygous recessive (dd).

  4. She is 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 DD and Dd people have the Rh antigen on the surface of their red cells which makes them Rh positive.

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