9. Genetic Inheritance in Plants

Exceptions to Mendel’s rules

There are some exceptions to Mendel’s principles, which have been discovered as our knowledge of genes and inheritance has increased. The principle of independent assortment doesn’t apply if the genes are close together (or linked) on a chromosome. Also, alleles do not always interact in a standard dominant/recessive way, particularly if they are codominant or have differences in expressivity or penetrance.

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