Discussion
Which of the following is NOT a premating mechanism of isolation ?
Answer: B
The one that is not a premating mechanism is zygotic mortality.
Premating (prezygotic) barriers stop mating or fertilisation from happening: temporal isolation (breeding at different times), behavioural isolation (different courtship signals) and mechanical isolation (incompatible genitalia or flower structure).
Zygotic mortality acts after fertilisation, when the hybrid zygote or embryo dies, so it is a postmating (postzygotic) barrier, along with hybrid inviability and hybrid sterility.
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