Multiple Choice
When the interaction of genes alters expected Mendelian genetic ratios, this phenomenon is called:
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3. Extensions to Mendelian Inheritance
Overview of interacting Genes
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Which of the following is an example of a prezygotic reproductive isolating mechanism?
A
Hybrid breakdown, where offspring of hybrids have reduced fitness
B
Hybrid inviability, where offspring fail to develop properly
C
Hybrid sterility, where offspring are sterile
D
Temporal isolation, where two species breed at different times
Verified step by step guidance1
Understand that reproductive isolating mechanisms prevent different species from interbreeding and producing viable, fertile offspring.
Recognize that prezygotic isolating mechanisms act before fertilization, preventing the formation of a zygote.
Identify examples of prezygotic mechanisms, such as temporal isolation, where species breed at different times, preventing mating.
Distinguish prezygotic mechanisms from postzygotic mechanisms, which occur after fertilization and include hybrid inviability, hybrid sterility, and hybrid breakdown.
Conclude that temporal isolation is a prezygotic mechanism because it prevents mating before a zygote can form, unlike the other options which affect offspring after fertilization.
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