Isogamy
The literal meaning of isogamy is "equal marriage" which refers to equal contribution of resources by both gametes to a zygote.[4] The term isogamous was first used in the year 1887.[who?][5]
Isogamy is a form of sexual reproduction that involves gametes of the same morphology (indistinguishable in shape and size), found in most unicellular eukaryotes.[1] Because both gametes look alike, they generally cannot be classified as male or female.[2]
Instead, organisms undergoing isogamy are said to have different mating types, most commonly noted as "+" and "−" strains.[3]
Different forms of isogamy: A) isogamy of motile cells, B) isogamy of non-motile cells, C) conjugation.