Biology · Genetic Disorders
Which of the following is a primary characteristic or cause of Down syndrome?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Mental retardation and physical features due to Trisomy 21✓
- 2Deficiency of clotting factor VIII
- 3Presence of an extra Y chromosome in males
- 4Absence of one X chromosome in females
Correct answer
Mental retardation and physical features due to Trisomy 21
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