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Distinguish Evidence from Reasoning
Grade Level
AP Biology
APB.048 Distinguish Evidence from Reasoning
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During AP Biology practice on hybrid fertility in two plant populations, students compare evidence and reasoning for this claim: Postzygotic reproductive isolation exists between the two plant populations. Which option is evidence?
A
Reduced hybrid fertility is a postzygotic barrier because it occurs after fertilization and hybrid development.
B
Hybrid offspring survived to adulthood, but only 5 percent of their pollen grains were viable compared with 92 percent in each parent population.
C
The low pollen viability supports the claim because hybrids formed but had greatly reduced fertility.
D
Reproductive isolation can limit gene flow even when mating and zygote formation occur.
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