Mary was born with one kidney. this variation in an inherited trait is most likely caused by a

The reason why Mary was born with only one kidney and the variation in the inherited trait is best explained of the cause is because of the mutation of which is an action of having the organ to be mutated because of alterations in the DNA, either deletion or insertion.

a motor homunculus represents a map of brain areas dedicated to motor processing for different anatomical divisions of the body.

homunculus represents the importance of various parts of your body as seen by your brain. as a result, they take up a lot of brain space. although the cortical homunculus is a curiosity, penfield's work in mapping the brain's relationship to the body was invaluable.

answer: the answer is b