Zygote with three copies chromosome 21, is known to cause _________?
Correct answer: D. Downs syndrome
- A. Hay fever
- B. Scurvy
- C. Parkinson Disease
- D. Downs syndrome
Explanation
A zygote with three copies of chromosome 21 has trisomy 21, which causes Down syndrome and is associated with characteristic developmental and physical features. Students may choose Parkinson disease because both can involve neurological effects, but Parkinson disease is not caused by chromosome 21 trisomy.
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About Chromosomes
Chromosomes are DNA-protein structures that carry genes and become visible during cell division. Coverage includes chromatin, centromeres, sister chromatids, homologous chromosomes, chromosome number, and the distinction between diploid and haploid cells, with links to DNA replication, mitosis and meiosis.
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