TY B
This oughta get good
Cats and quick reflexes
But why are there so few copies of the Rh- allele? And why does it vary so widely between populations? There is no clear answer, but there is a very interesting hypothesis involving cats and quick reflexes.
There is a parasite called Toxoplasma gondii that normally infects cats. When this parasite infects humans, it can cause people to react more slowly. Studies have shown that Rh+ heterozygotes (people who carry the Rh+ and Rh- allele) may be resistant to this symptom.
Some scientists think that because of this resistance, the Rh- allele has stayed in the population, even though the Rh- trait can cause difficulties for Rh- women during pregnancy.
Different rates of infection by this parasite may have caused different frequencies of the Rh- allele. For example, the large number of wild cats in Africa and Asia could have raised the frequency of Rh- there….
By Joe Davis, Stanford University
https://genetics.thetech.org/ask-a-geneticist/rh-positive-parents-multiple-rh-negative-children
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