If a nondisjunction event occurred in Anna during meiosis I, which lane (A, B, C, D) best fits the genotype of their child? Explain your choice, clearly identifying why that lane is correct and why the other lanes are incorrect. Assume no recombination.

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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Question 3
Syed
(produces
sperm)
Anna
(produces
eggs)
A
| |
B
C
| | |
| |
D
||
Transcribed Image Text:Question 3 Syed (produces sperm) Anna (produces eggs) A | | B C | | | | | D ||
Question 3
Anna (who produces eggs) and Syed (who produces sperm), have a child with Down's syndrome that results from
trisomy of chromosome 21. Using a microsatellite sequence on chromosome 21, you run a gel. The gel imaged is
attached; darker bands indicate signals of twice the intensity.
If a nondisjunction event occurred in Anna during meiosis I, which lane (A, B, C, D) best fits the genotype of their
child? Explain your choice, clearly identifying why that lane is correct and why the other lanes are incorrect.
Assume no recombination.
Transcribed Image Text:Question 3 Anna (who produces eggs) and Syed (who produces sperm), have a child with Down's syndrome that results from trisomy of chromosome 21. Using a microsatellite sequence on chromosome 21, you run a gel. The gel imaged is attached; darker bands indicate signals of twice the intensity. If a nondisjunction event occurred in Anna during meiosis I, which lane (A, B, C, D) best fits the genotype of their child? Explain your choice, clearly identifying why that lane is correct and why the other lanes are incorrect. Assume no recombination.
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