The somatic cells of most individuals with Down syndrome contain an extra chromosome 21, for a total of forty-seven chromosomes. a. At which stage(s) or meiosis could nondisjunction alter the chromosome number? b. A few individuals with Down syndrome have forty-six chromosomes: two normal-appearing chromosomes 21, and a longer-than-normal chromosome 14. Speculate on how this chromosome abnormality may arise.

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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
BuyFind

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332

Solutions

Chapter 14, Problem 8GP
Textbook Problem

The somatic cells of most individuals with Down syndrome contain an extra chromosome 21, for a total of forty-seven chromosomes.

  1. a. At which stage(s) or meiosis could nondisjunction alter the chromosome number?
  2. b. A few individuals with Down syndrome have forty-six chromosomes: two normal-appearing chromosomes 21, and a longer-than-normal chromosome 14. Speculate on how this chromosome abnormality may arise.

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Biology: The Unity and Diversity of Life (MindTap Course List)

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