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Chapter 9

Section 2

TermDefinition
the entire genetic makeup of an organism; also the combination of genes for one or more specific traits genotype
an organism's appearance or other detectable characteristic that results from the organism's genotype and the environment phenotype
describes an individual that has identical alleles for a trait on both homologous chromosomes homozygous
describes an individual that has two different alleles for a trait heterozygous
the likelihood that a possible future event will occur in any given instance of the event; the mathematical ratio of the number of times one outcome of any event is likely to occur to the number of possible outcomes of the event probability
a cross between individuals that involves one pair of contrasting traits monohybrid cross
a graphic used to predict the results of a genetic cross Punnett square
the ratio of the genotypes that appear in offspring genotypic ratio
the ratio of phenotypes produced by a cross phenotypic ratio
the crossing of an individual of unknown genotype with a homozygous recessive individual to determine the unknown genotype testcross
a relationship in which one allele is completely dominant over another complete dominance
a condition in which a trait in an individual is intermediate between the phenotype of the individual's two parents because the dominant allele is unable to express itself fully incomplete dominance
a condition in which both alleles for a gene are fully expressed codominance
a cross between individuals that have different alleles for the same gene dihybrid cross
Created by: fasolak16
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