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If mammalian ovum fails to get fertilized, which one of the following is unlikely?

1. Corpus luteum will disintegrate
2. Progesterone secretion rapidly declines
3. Estrogen secretion further decreases
4. Primary follicle starts developing

Correct answer: Primary follicle starts developing

Solution

If the ovum is not fertilized, the corpus luteum degenerates, so progesterone falls and estrogen also drops. The next cycle is initiated by FSH acting on existing follicles, making immediate development from a primary follicle the unlikely event.

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