what is the difference between oogamy,isogamy&anisogamy?

1.	what is the difference between oogamy,isogamy&anisogamy?
Answer» Anisogamy is the phenomenon of fertilization of large gametes (egg cells, ova) by (or with) small gametes (sperm cells: spermatozoa or spermatia). Gamete size difference is the fundamental difference between females and males. ... However, in Ascomycetes, anisogamy evolved from isogamy before mating types.

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