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In oogamy, fertilization involves

1. a small non-motile female gamete and a large motile male gamete
2. a large non-motile female gamete and a small motile male gamete
3. a large non-motile female gamete and a small non motile male gamete
4. a large motile female gamete and a small nonmotile male gamete

Correct answer: a large non-motile female gamete and a small motile male gamete

Solution

In oogamy, the female gamete is large and non-motile, while the male gamete is small and motile. This size-and-mobility difference is the key feature that distinguishes oogamy from other forms of gamete fusion.

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