Biology · Human Genetics
A fetus is diagnosed with trisomy of chromosome 21. Which statement BEST describes the condition the fetus is likely experiencing?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1The fetus has an additional copy of chromosome 21, leading to Turner syndrome.
- 2The fetus has a deletion of chromosome 21, leading to severe developmental delays.
- 3The fetus has an extra copy of chromosome 21 due to meiotic nondisjunction, leading to Down syndrome.✓
- 4The fetus has a duplication of the long arm of chromosome 21, resulting in Edwards syndrome.
Correct answer
The fetus has an extra copy of chromosome 21 due to meiotic nondisjunction, leading to Down syndrome.
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