Multiple Choice
Mutant tetraploid plants typically:
2
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3. Extensions to Mendelian Inheritance
Overview of interacting Genes
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Which of the following best describes postzygotic barriers in the context of interacting genes?
A
They prevent the formation of hybrid offspring after fertilization has occurred.
B
They promote the fusion of gametes from different species before fertilization.
C
They enhance gene flow between populations by increasing hybrid viability.
D
They prevent mating between individuals of different species.
Verified step by step guidance1
Understand that postzygotic barriers are reproductive isolating mechanisms that act after fertilization has taken place.
Recall that fertilization results in the formation of a zygote (a fertilized egg), so postzygotic barriers affect the viability or fertility of the hybrid offspring.
Recognize that postzygotic barriers do not prevent mating or fertilization but instead reduce the survival or reproductive success of hybrids, thereby preventing gene flow between species.
Contrast postzygotic barriers with prezygotic barriers, which prevent mating or fertilization from occurring in the first place.
Conclude that the best description of postzygotic barriers is that they prevent the formation of viable or fertile hybrid offspring after fertilization has occurred.
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