Answer:
Alleles fit into the provided definitions as follows:
A) Alleles are alternative forms of a gene: This statement is accurate. Alleles are different versions or variants of a gene that can code for different traits or characteristics.
B) Different alleles may produce differences in the phenotype of an organism: This statement is also correct. The presence of different alleles for a specific gene can result in variations in the physical or observable traits (phenotype) of an organism.
C) The set of alleles for a given trait carried by an organism is called the phenotype: This statement is incorrect. The set of alleles an organism carries for a given trait is called its genotype, not its phenotype. Phenotype refers to the observable traits or characteristics of an organism.
D) A population can contain many alleles for a gene, but an individual diploid organism has only two alleles for a gene: This statement is accurate. In a population, there can be multiple alleles for a specific gene, but an individual organism (assuming it is diploid, meaning it has two sets of chromosomes) typically has only two alleles for each gene, one inherited from each parent. These two alleles can be the same (homozygous) or different (heterozygous).
Step-by-step explanation: