BIOLOGY
BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Chapter 13, Problem 3A

Down syndrome is the result of trisomy for chromosome 21. Why is this trisomy viable and trisomy for most other chromosomes is not?

a. Chromosome 21 is a large chromosome and excess genetic material is less harmful.

b. Chromosome 21 behaves differently in meiosis I than the other chromosomes.

c. Chromosome 21 is a small chromosome with few genes so this does less to disrupt the genome.

d. Chromosome 21 is less prone to nondisjunction than other chromosomes.

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