Trait - A characteristic that an organism can pass on to its offspring through its genes., Genetics - The scientific study of heredity, Dominant allele - An allele whose trait always shows up in the organism when the allele is present., Recessive allele - An allele that is hidden whenever the dominant allele is present, Punnent square - A chart that shows all the possible combinations of alleles that can result from a genetic cross, Phenotype - An organism's Physical appearance, or visible traits. , Genotype - An organism's Genetic makeup, or allele combinations. (the letters), Codominance - both alleles are expressed equally (black and white feather color), polygenic inheritence - more than one gene affects a trait (hair color, eye color, skin color), incomplete dominance - blending of traits (snap dragon Pink color), multiple alleles - 3 or more possible alleles for a trait (blood type), cross pollination - technique Mendel used when crossing parent generations for his experiments, Heterozygous  - having two different alleles for a trait (one capital, one lower case), Homozygous Dominant - having two identical Dominant alleles of a particular gene or genes (2 capital letters), Homozygous Recessive - having two identical recessive alleles of a particular gene or genes. (2 lower case letters), trait - a genetically determined characteristic (ie: flower color), genes - factors that control traits, Rr - One Dominant and one recessive allele, probability - a number that describes how likely it is that an event will occur, RR - two Dominant alleles, rr - two recessive alleles,

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