Question Detail

BIO 201 Genetics 1 Objective Question
Take CBT

Question

Down syndrome in humans is primarily caused by which cytogenetic event?
Options
A Robertsonian deletion of the short arm of chromosome 5
B Meiotic non-disjunction leading to trisomy 21
Correct Answer
C Monosomy of chromosome 21
D Dispermy involving chromosome 21 exclusively
Correct Answer

Option B is the correct answer.

Detailed Explanation

Approximately 95% of Down syndrome cases result from maternal meiotic non-disjunction of chromosome 21, resulting in full trisomy 21.

Hint

No hint available

Question Info

Course: BIO 201
Topic: Genetics 1
Type: Objective
Difficulty: Not specified
Question 250 of 285
Previous Course Details Next