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Mendel deduced that each parent in a monohybrid cross contributes:
ABoth of its paired unit factors
BTwo of four paired unit factors
CNone of its paired unit factors
DOne of two paired unit factors
Answer & Solution
Correct answer: D. One of two paired unit factors
1. The F2 ratios could not be explained by blending or by whole-genome inheritance.
2. On the basis of his results in F1 and F2 generations, Mendel postulated that each parent in the monohybrid cross contributed one of two paired unit factors to each offspring.
3. Every possible combination of unit factors was equally likely.
4. Those unit factors are what we now call alleles.
5. If each parent contributed both factors the offspring would be tetraploid, which they are not.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 12 'Mendel's Experiments and Heredity', sections 12.1-12.3_
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