Question

Which description is correct for both oogenesis and spermatogenesis?
The cells have 46 chromosomes until meiosis II is completed.
After meiosis I, the cells have 23 chromosomes.
Part of meiosis I is completed before birth.
The entire process takes about 70 days.

Answer 1

"After meiosis I, the cells have 23 chromosomes."

Explanation:
- Meiosis I is the reductional division: diploid (46) → haploid (23) in both oogenesis and spermatogenesis.
- The other statements are incorrect for both: (1) is false because chromosome number is reduced at meiosis I, not only after meiosis II; (3) applies only to oogenesis (female meiosis begins prenatally and arrests in prophase I); (4) applies only to spermatogenesis (~64–72 days), not oogenesis (which can take years).