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Genetic Inheritance of Rh Blood Type

When referring to the Rh blood type, it usually involves the first gene pair, where the presence of the D gene leads to an Rh-positive blood type, while its absence results in a Rh-negative blood type. Individuals with genotypes DD or Dd are Rh-positive, indicating they have the D antigen in their red blood cells. In contrast, individuals with the genotype dd are Rh-negative. Here are three scenarios illustrating how this inheritance can work:

Case 1: Both parents are Rh-positive but carry a recessive gene (Dd).

  • There is a 25% chance that their child will be Rh-negative.

Case 2: One parent is Rh-positive with a recessive gene (Dd), and the other parent is Rh-negative (dd).

  • There is a 50% chance that their child will be Rh-negative.

Case 3: Both parents are Rh-negative, carrying the recessive gene (dd).

  • There is a 100% chanc
  • e that their child will be Rh-negative.