SAT Subject Biology Practice Question 151: Answer and Explanation

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Question: 151

1. The phenomenon depicted in the diagram is known as

A. linkage
B. independent assortment
C. crossing over
D. nondisjunction
E. mutation

Correct Answer: D


When homologous chromosomes fail to segregate during meiosis, the resulting gametes either lack that chromosome or possess an extra copy. This phenomenon is known as nondisjunction.

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