Allopatric speciation, Sympatric speciation, i) Gene flow interrupted/ reduced due to geographical barrier., ii) A population form new species while geographically isolated., iii) Population undergo evolution change., iv) Reproductive isolation established, i) Speciation take place in geographically overlapping population.  , ii) A small population becomes new species without geographic speciation, iii) Results from non-random mating due to sexual selection, iv) A reproductive barrier isolates a subset of a population without geographic separation from the parent species., Prezygotic/ habitat/ seasonal/ behavioural/ mechanical/ genetic/ ecological, Post zygotic/ hybrid inviability/ reduced hybrid fertility/ hybrid sterility/ hybrid breakdown, It can overcome hybrid sterility, 42.

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