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Monozygotic twins arise from a single embryo whose cells divide into two groups within about how many days of zygote formation?
AWithin 8 days
BWithin 28 days
CWithin 90 days
DWithin 9 months
Answer & Solution
Correct answer: A. Within 8 days
1. Monozygotic twins come from one embryo.
2. Its cells split into two groups during early development, within 8 days of zygote formation.
3. Each group develops as a separate embryo, giving identical twins of the same gender.
4. A split after 8 days risks conjoined twins, and 28 days, 90 days and 9 months are unrelated spans, so those are ruled out.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 3 "Life Processes in Living Organisms Part 2", p.42_
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