In 1940, two researchers named Weiner and Landsteiner discovered that about 85% of the human population sampled possessed a blood cell protein called the Rh factor. The presence of Rh factor was labeled Rh positive (Rh⁺) and was found to be dominant over the absence of the blood factor (Rh^-). Rh factor is inherited in a typical Mendelian pattern. Based on this information, one could predict that two Rh⁺ parents could never have an Rh^- child.

Question

Quizplus · Accepted Answer

While it is less likely for two Rh positive parents to have an Rh negative child, it is still possible. If both parents are heterozygous (Rh⁺), there is a 25% chance that their child will inherit Rh^- from both parents and thus be Rh negative.

In 1940, Two Researchers Named Weiner and Landsteiner Discovered That