AP BIOLOGY

Detailed explanation-1: -The presence of two different alleles at a particular gene locus. A heterozygous genotype may include one normal allele and one mutated allele or two different mutated alleles (compound heterozygote).

Detailed explanation-2: -Crossing of two heterozygous individuals will result in predictable ratios for both genotype and phenotype in the offspring. The expected phenotypic ratio of crossing heterozygous parents would be 9:3:3:1.

Detailed explanation-3: -Heterozygous, as related to genetics, refers to having inherited different versions (alleles) of a genomic marker from each biological parent. Thus, an individual who is heterozygous for a genomic marker has two different versions of that marker.

Detailed explanation-4: -The risk will be the same for every birth. If both parents have a heterozygous dominant mutation, their children have a 50% chance of getting the dominant allele (partial or complete symptoms), a 25% chance of getting both dominant alleles (symptoms), and a 25% of getting both recessive alleles (no symptoms).