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Describe two types of postzygotic reproductive isolating barriers and the process by which such barriers may...

Describe two types of postzygotic reproductive isolating barriers and the process by which such barriers may arise.

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Answer #1

Post zygotic reproductive barriers are the one which play their role after mating of two species.They might be 1)Hybrid inviability and

2) Hybrid sterility.

Hybridinviability:

  • Hybrid inviability is a post-zygotic barrier, which lessens the ability of a hybrid to develop into a healthy adult.
  • This decreased health prevents flow of genes between the two species.
  • Process why it arrives: The hybrid inviability occurs because of the combined effect of parental genes.These genes obstruct the embryo's development further preventing the embryo's maturation.

Hybrid sterility:

  • Hybrid sterility is the condition where the adults formed after mating of two species,fails to develop gamete formation.
  • They remain sterile without being producing viable gametes.
  • Process why it occurs: The embryo is formed with mixed traits and this further results in formation of frail.
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