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Two mammals, a sheep and a goat, produce offspring. Only the F 1 and F 2 generations produce fertile offspring. This occurs as a result of:
A) mutation.
B) hybrid sterility.
C) microevolution.
D) hybrid inviability.
E) hybrid breakdown.
Hybrid Sterility
A postzygotic reproductive isolating mechanism in which an interspecific hybrid cannot reproduce successfully.
Hybrid Breakdown
A postzygotic reproductive isolating mechanism in which, although an interspecific hybrid is fertile and produces a second (F2) generation, the F2 has defects that prevent it from successfully reproducing.
Microevolution
Evolutionary change within a species or small group of organisms, especially over a short period.
- Identify the consequences of hybridization between different species.
- Distinguish between prezygotic and postzygotic barriers and their significance in speciation.
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Learning Objectives
- Identify the consequences of hybridization between different species.
- Distinguish between prezygotic and postzygotic barriers and their significance in speciation.
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