Sexual reproduction, Biology

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1.       Amphigony        -          Zygote is formed.

(i) Syngamy

Fusion of gametes.

(a) Endogamy - It involves self fertilisation. e.g. Taenia.

(b) Exogamy - It involves cross fertilisation. e.g. Earthworm, cockroach.

Again syngamy is of 2 types - (i) Isogamy - monocystis

(ii) Anisogamy - rest all

Special form of syngamy-

(i) Neotany - Sexual reproduction in larval stage, e.g. axolotal larva of ambyostoma, urochordata.

(ii) Polyembryony - The blastomeres formed by division of zygote separate at early stage. Each produces a complete individuals. e.g. flateworm, identical twins, armadillo produces 4 young ones from one zygote.

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