Which sentence properly uses the word genotype?
a, each of the homologous chromosomes in the pair had the same recessive genotype.
b, having inherited one dominant and one recessive gene for height, the genotype of the plant was heterozygous.
c, each gamete had the same genotype on each chromosome, so the result was identical twins.
d, the genotype was not a mutation because mrna successfully copied the dna strand.