Which chromosomal change causes Down syndrome?
Answer and explanation
Correct answer: A. Trisomy 21, an extra copy of chromosome 21
- Step 1: Non-disjunction leads to three copies of chromosome 21. Step 2. This causes Down syndrome. Answer: trisomy 21. Why not the others: these cause other conditions.
Practise more Cell Biology, Metabolism and Genetics.
Free questions with an explanation for every one, and full timed German Abitur mock tests.
More Cell Biology, Metabolism and Genetics questions
- Which organelle is the main site of ATP production in eukaryotic cells?
- Which base pairs with adenine in DNA?
- What is the plant cell wall mainly made of?
- Where in the chloroplast do the light-dependent reactions of photosynthesis take place?
- What happens to red blood cells placed in a hypotonic solution?
- What does a competitive inhibitor do to an enzyme?