The genotype is the set of Alleles corresponding to a particular Gene of an individual (vid). Sometimes, it can refer to the set of alleles of a set of genes, I think. The set of alleles for all genes, is called the Genome.

Ploidy

• Haploid, if the genotype contains a single allele.
• Diploid, if the genotype contains a two alleles.
• Polyploid, if the genotype contains a more than two alleles.

Zygosity

• Homozygote, if the genotype is diploid and the two alleles are the same.
• Heterozygote, if the genotype is diploid and the two alleles are the same.