Multiple choice

Select the true statement regarding the Rh positive people.

  1. They may be homozygous dominant (DD) or heterozygous (Dd) for this trait.

  2. They all are strictly homozygous dominant (DD) for the trait.

  3. They all are strictly homozygous recessive (dd).

  4. They may be homozygous recessive (dd) or heterozygous (Dd) for the 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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