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SEXUAL REPRODUCTION
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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