The cross aabb × aabb is an example of a cross; the results of such crosses led mendel to propose what we now call the law of

The law of dominance

Explanation:

This cross (aabb x aabb) is an example of a double homozygous recessive cross. When organisms with recessive traits are crossed among themselves, the offspring will all show the recessive traits. Conversely, when one of the parents (or both) has a dominant allele for one of the genes, the offspring will show the dominant trait in a given proportion which normally is larger than the offspring with the recessive traits. These crosses led Mendel to propose the law of dominance.

answer:

sequence 1- deletion

                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion