What is Mendel's Law of Independent Assortment?An explanation of Mendel's Law.

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trophyhunter1 | College Teacher | (Level 1) Educator Emeritus

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The Law of Independent Assortment states that allele pairs separate independently of one another during gamete formation. When Mendel  performed a dihybrid cross with pea plants,  a ratio of 9:3:3:1 resulted. That is because the trait of color(yellow or green) and the seed shape(round or wrinkled) were inherited independently of eachother resulting in four different genotypes. These were yellow and round, yellow and wrinkled, green and round and green and wrinkled. The more alleles, the more possible combinations which will result in many different genotypes as well as phenotypes in the offspring. That explains why within one family, there can be much variation amongst siblings due to the Law of Independent Assortment. Much like shuffling a deck of cards, we don't always get the same combination of cards each time!``