AP BIOLOGY

Detailed explanation-1: -The four common allele of C gene are C, cch, ch and c. A rabbit with genotype CC has black or brown fur, cchcch have chinchilla or greyish coat colour, chch have Himalayan pattern and cc have white coat colour, i.e. albino. Due to multiple alleles, there are many combinations of alleles possible.

Detailed explanation-2: -An example of multiple alleles is coat color in rabbits (Figure 1). Here, four alleles exist for the c gene. The wild-type version, C+C+, is expressed as brown fur.

Detailed explanation-3: -The A gene has three different alleles, the A allele causes the agouti pattern, the at allele causes the tan pattern, and the a allele causes the self-pattern. The agouti pattern A is considered the wild-type allele, which appears as a multicolored speckled coat with brown, black and white.

Detailed explanation-4: -An excellent example of multiple allele inheritance is human blood type. Blood type exists as four possible phenotypes: A, B, AB, & O. There are 3 alleles for the gene that determines blood type. (Remember: You have just 2 of the 3 in your genotype—1 from mom & 1 from dad).

Detailed explanation-5: -An example of multiple alleles is the ABO blood group system in humans. Human gene I (I for ‘isohaemagglutinin’) exists in three allelic forms: IA, IB, and IO. IA and IB produce type A and type B antigens, respectively, on the cell surface of RBCs whereas IO (or i) is a recessive allele and does not produce antigen.