genetics - study of the heredity patterns and variations of organisms, heredity - the transmission of such qualities from ancestor to descendant through the genes, allele - any of the alternative forms of a gene that occurs at a specific place on a chromosome, genotype - collection of all of an organism's genetic information that codes for traits, phenotype - collection of all of an organism's physical characteristics, homozygous - characteristic of having two alleles of the same alleles at the same locus of sister chromatids, heterozygous - characteristic of having two different alleles that appear at the same locus of sister chromatids, monohybrid cross - cross, or mating, between organisms that involves only one pair of contrasting traits, dihybrid cross - cross, or mating, between organisms involving two pairs of contrasting traits, codominance -  heterozygous genotype that equally expresses the traits from both alleles, incomplete dominance - heterozygous phenotype that is a blend of the two homozygous phenotypes, sex-linked traits - trait whose genes are located on a sex chromosome, multiple alleles - an allele of a genetic locus having more than two allelic forms within a population, polygenic traits - trait that is produced by two or more genes, dominant - allele that is expressed when two different alleles are present in an organism's genotype, recessive - allele that is not expressed unless two copies are present in an organism's genotype, purebred - type of organism whose ancestors are genetically uniform, hybrid - something heterogenous in origin or composition, gene - specific region of DNA that codes for a particular protein,

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