Can a person have more than two alleles for a single gene?

Consider a gene with the alleles of A & a. If each person has two alleles, one from each parent, what are the three possible combinations these alleles could form in individuals?

A. having more than two alleles is lethal B. having more than two alleles unbalances the chromosomes C. A person has two parents who each contribute one allele D. a backup set of alleles is necessary in case something goes wrong

73. Coloration in the peppered moth (Biston betularia) is determined by a single gene with two alleles showing complete dominance. Dark moths are homozygous dominant or heterozygous for the gene, light moths are homozygous recessive. In a sample of ...

a. the sequences of the DNA for each allele would be different and produce different proteins. b. the sequences of the DNA would be identical for each allele and would produce identical proteins. c. the sequences of the DNA would be identical for each...

Therapy vs. Enhancement Scientists in New Jersey have recently inserted a gene to create a mouse with increased capacity for learning and memory -- basically, a gene that increased the animal's intelligence quotient (IQ). Normal, average human IQ is...

In sweet pea, gene C is responsible for color production and gene P is responsible for the purple color pigment. Both of them are located on two different loci on different chromosomes. The flowers will be purple only when the plant has the genotypes...