Because the soil didn't have the same nutrients it has now due to lack of decomposition of other plants and animals.
A duplication is a mutation where the chromosome carries repetitive sets for a gene.
<span>biological </span>evolution<span> is the process of change by which new species develop from preexisting species over time; in </span>genetic terms<span>, </span>evolution<span> can be defined as any change in the frequency of alleles in populations of organisms from generation to generation.</span>
Zero of the offspring will be bb. Since each offspring receives one allele from each parent, all will receive a B from Dad and a b from Mom, making all of the offspring heterozygous (Bb) and brown-eyed.
