autosome, in humans ther are 22 pairs, these code for similar traits, sex chromosomes, in humans there is 1 pair, these code for sexual traits, alleles, variations of a gene, you have 2 for each trait, you get 1 from each parent, Dominant Allele, represented by a Capital, always shows when present, Recessive Allele, represented by a lowercase, only shows when 2 recessive are present, Homogeneous, two of the same allele (AA), Heterogeneous, two different alleles (Aa), Genotype, the combination of alleles (Aa, aa, AA), Phenotype, the trait present (brown eyes, blue eyes)

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