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[–]kwallio 10 insightful - 1 fun10 insightful - 0 fun11 insightful - 1 fun -  (3 children)

Like the first poster says, you have it back to front. The sex is defined as gamete size, you can have animals with no sexual dimorphism where the sexes are identical and can't be told apart (I own one of these, an angelfish) or have sexes where there is a large size difference (anglerfish). The size difference in gametes is NOT the result of sexual dimorphism, I think you need to become educated on sexual dimorphism because its not always about size (males can have different color feathers but be the same size like in some birds). Its just an observational difference between the sexes.

[–]MezozoicGaygay male 7 insightful - 1 fun7 insightful - 0 fun8 insightful - 1 fun -  (1 child)

Some animals have it reversed, females are much bigger and stronger than males.

[–]kwallio 5 insightful - 1 fun5 insightful - 0 fun6 insightful - 1 fun -  (0 children)

Yes thats true. In fact females being larger is more typical than the reverse.

[–]kwallio 4 insightful - 1 fun4 insightful - 0 fun5 insightful - 1 fun -  (0 children)

Also wouldn't your idea of size = size of gamete kinda fail in species in which the males are larger? I mean you can observe which cell is larger pretty easily.