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Kaplan Qbank USMLE



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Mr. Spock's father came from planet Vulcan, and his mother was from Planet Earth. A Vulcan has pointed ears and a heart located on the right side of th echest. Mr. Spock has both of these traits, which are known to be determined by two different genes, each with two alleles. Suppose that Mr. Spock married an Earth woman and that they had many children. About half of their children have pointed ears and a right-sided heart, like Spock, and about half have rounded ears and a left-sided heart, like their mother.

a) What would Mendel predict the progeny phenotypes and ratios to be? Explain your answer using formal genetic teminology.

b) How do you explain the actual results?


I know it might seem like an elementary question, but i cant seem to think hard enough to figure it out.








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