AP BIOLOGY

Detailed explanation-1: -Answer and Explanation: Correct option is (c) flower color in Mendel pea plant. This is because it follows Mendel law of inheritance which state that it will be caused by the two contrasting alleles of one gene only.

Detailed explanation-2: -Under this system phenotypes designated by a capital letter such as A would correspond to either a homozygous dominant (AA) or heterozygous (Aa) genotype while phenotypes designated by a lower case letter such as a would correspond to homozygous recessive genotype (aa).

Detailed explanation-3: -If you have an AA or AO genotype, you will have the phenotype of type A blood; if you have a BB or BO genotype, you will have a type B blood phenotype; if you have an AB genotype, you will have a type AB blood phenotype; and if you have an OO genotype, you will have a type O blood phenotype.

Detailed explanation-4: -Not all pairs of alleles will have the same phenotype: dominance when AA = Aa in phenotype, A is dominant, a is recessive. An allele can be dominant over one allele but recessive to another allele.

Detailed explanation-5: -Types of Genotype The genotypes in humans are AA, AS, AC, SS. They refer to the hemoglobin gene constituents on the red blood cells. AC is rare whereas AS and AC are abnormal.