16
Only one; A. At least concerning this one trait.
genotype and phenotype
2 can
RrYy
I think it's genotype...
Dd is the heterozygous genotype for dimples.
An individual with a heterozygous genotype cannot be true-bred.
Genotype
Two: TG and tG
The term allele is different from a genotype because an allele can be singular, but the alleles that an individual (diploid organism) has at a certain locus are called a genotype.
Genotype is the alleles (different forms of a gene) which an individual has with respect to a particular characteristic. The Phenotype is how these genes are expressed in an individual.
For the case of the human, an individual with XX genotype is female. Other organisms have different ways of determining sex.