Question Detail

BIO 101 BIO 101 Past Questions Objective Question
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Question

Trisomy 21 is caused by:
Options
A Gene deletion
B X-linked inheritance
C Nondisjunction during meiosis
Correct Answer
D Polygenic effects
Correct Answer

Option C is the correct answer.

Detailed Explanation

Down syndrome (Trisomy 21) is most commonly caused by nondisjunction during meiosis, where chromosome 21 fails to separate properly, resulting in a gamete with an extra copy of chromosome 21.

Hint

It's an error in chromosome separation.

Question Info

Course: BIO 101
Topic: BIO 101 Past Questions
Type: Objective
Difficulty: Not specified
Question 925 of 2556
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