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Mendel studied inheritance of seven pairs of traits in Pea which can have 21 possible combinations. If you are told that in one of these combinations, independent assortment is not observed in later studies, your reaction will be

1. Independent assortment principle may be wrong
2. Mendel might not have studied all the combinations
3. It is impossible
4. Later studies may be wrong

Correct answer: Mendel might not have studied all the combinations

Solution

Mendel’s law of independent assortment is a general rule, but it does not apply to every possible gene pair combination. If one combination later shows no independent assortment, the most reasonable conclusion is that Mendel may not have examined that specific case, rather than rejecting the whole principle.

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