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Genotype is the genetic make-up or the genetic constitution of an organism. It's the particular combination of alleles an organism possesses. The combination can be heterozygous or homozygous. Heterozygous is where there are two different alleles on the corresponding chromosomal loci. It is usually represented by a big case letter and a small case letter (Tt, tT, pP...)--- indicating that there is one recessive gene and one dominant gene. Homozygous (TT, tt, pp,PP), on the other hand, is where both alleles are the same. The two corresponding chromosomal loci either both have the dominant gene or the recessive gene.

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14y ago

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