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Chapter 9

Section 2: Genetic Crosses

TermDefinition
Genotype An organism's genetic makeup
Phenotype An organism's appearance
Homozygous When both alleles of a pair are alike
Heterozygous When the two alleles in a pair are different
Probability The likelihood that a specific event will occur
Monohybrid Cross A cross in which only one characteristic is tracked
Punnett Square A graphic used to predict the results of a genetic cross
Genotypic Ratio The ratio o the genotypes that appear in offspring
Phenotypic Ratio The ratio of an offspring's phenotypes
Testcross An individual of unknown genotype is crossed with a homozygous recessive individual
Complete Dominance One allele is completely dominant over another
Incomplete Dominance The F1 offspring will have a phenotype inbetween that of the parents
Codominance Occurs when both alleles for a gene are expressed in a heterozygous offspring
Dilhybrid Cross A cross in which two characteristics are tracked
Created by: McLeanE18
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