Gene - Sequence of bases on DNA that codes for a specific trait, Alleles - Different versions of the same gene, Dominant allele - Allele that masks the effect of recessive alleles but co-dominant alleles have joint effects, Recessive allele - Allele that only controls a trait when in the homozygous state, Phenotype - The observable characteristics of a specific trait, Genotype - The alleles possessed for a specific gene, Homozygous - The possession of two identical alleles for a gene, Heterozygous - The possession of different alleles for a gene, Gene locus - The position occupied by a gene on a chromosome, Co-dominance - When pairs of alleles are both expressed equally in the phenotype of a heterozygous individual, Homologous chromosomes - Chromosomes that carry the same sequence of genes but not necessarily the same alleles of those genes, Chromosome number - A characteristic feature of members of a species,

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