AP BIOLOGY

Detailed explanation-1: -Number of genotypes for a given number of alleles Given n alleles at a locus, the number genotypes possible is the sum of the integers between 1 and n: With 2 alleles, the number of genotypes is 1 + 2 = 3. 3 alleles there are 1 + 2 + 3 = 6 genotypes. 4 alleles there are 1 + 2 + 3 + 4 = 10 genotypes.

Detailed explanation-2: -Likewise, haploid organisms have single allelic forms, while tetraploids may have as many as four allelic variants in one individual. If an organism possesses the same allelic form of a gene in each of its homologous chromosomes, then it is considered as homozygous for that gene.

Detailed explanation-3: -A description of the pair of alleles in our DNA is called the genotype. Since there are three different alleles, there are a total of six different genotypes at the human ABO genetic locus. The different possible genotypes are AA, AO, BB, BO, AB, and OO.

Detailed explanation-4: -Types of gametes produced by organism= 2n wherein n= number of loci for which the organism is heterozygous. The given diploid organism is heterozygous for 4 loci, types of gametes produced = 24= 16.