Assortment of chromosomes according to Mendel, is when alleles on the chromosomes get separated into gametes independenly of one another. Independent assortment reshuffles or rearranges the chromosomal pair in the resulting gametes. 2^n is a mathematical expression that can be used to determine the number of possible chromosome combinations, which n is the number of chromosomes that can be present in one gamete.
In this case, the organism has an haploid number of 6, meaning that 6 chromosomes can be present in the gamete. Hence, 2^6 will give rise to 64 possible combinations of chromosomes in each gamete.
