Question: what is the difference between homozygous and heterozygous alleles?
Answer: Organisms can be homozygous or heterozygous for a gene. ... An organism can be homozygous dominant, if it carries two copies of the same dominant allele, or homozygous recessive, if it carries two copies of the same recessive allele. Heterozygous means that an organism has two different alleles of a gene.