World-famous medical doctor that dabbles in research from time to time, you\'ve

Question

World-famous medical doctor that dabbles in research from time to time, you've taken a recent interest in a newly discovered c that appears to cure Sheltonitis, a terrible disease in which the affected suffers from superiority complex and other associated symptoms. However, this drug appears to work in only 33% of patients, while the remaining 67% seem completely immune to the drug. You head to your basement lab with your data to solve the mystery. 1. You have complete family history for a large family in which every family member is affected by Sheltonitis. You've constructed a family tree to discern the heritability of the drug- susceptibility phenotype. RR Rr RR RR RR Rr RR RR

Explanation / Answer

As the parents of the father of the propositus are RR and rr, the father's genotype would be Rr.
that combined with rr will give two types of progeny: Rr or rr. So there is a 50% chance that the propositus will be cured by the drug.

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