Multiple choice

Select the true statement about Rh positive people.

  1. They are either homozygous dominant (XX) or heterozygous (Xx) for this trait.

  2. They all are homozygous dominant (XX) individuals.

  3. They are all homozygous recessive (xx) individuals.

  4. They are either homozygous recessive (xx) or heterozygous (Xx) 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 Rh antigen on the surface of their red cells which make them Rh positive.

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