In a genetic cross involving codominant alleles, what is the key difference between a heterozygous individual and a homozygous individual?

Question

A
Heterozygous individuals have two different alleles for the same gene, while homozygous individuals have two identical alleles.
B
Heterozygous individuals have two identical alleles for the same gene, while homozygous individuals have two different alleles.
C
Heterozygous individuals display the dominant allele phenotype, while homozygous individuals display the recessive allele phenotype.
D
Heterozygous individuals display the recessive allele phenotype, while homozygous individuals display the dominant allele phenotype.

Answer 1

A. Heterozygous individuals have two different alleles for the same gene, while homozygous individuals have two identical alleles.