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Chapter 9 Vocab
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12
Biology
9th Grade
01/11/2012

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Term
genotype
Definition
organism's genetic makeup
Term
phenotype
Definition
organism's appearance
Term
homozygous
Definition
when 2 alleles in the pair are alike (homo means same!)
Term
heterozygous
Definition
when 2 alleles in the pair are different
Term
monohybrid cross
Definition
a cross between 2 pairs
Term
test cross
Definition
cross of a homozygous recessive individual (rr) with an individual with a dominant phenotype of unknown genotype
Term
genotypic ratio
Definition
fraction of genotypes
Term
phenotypic ratios
Definition
fraction of phenotypes
Term
complete dominance
Definition
when heterozygous (Rr) plants and homozygous (RR) plants have the same phenotype --- when they look the same since both have a dominant gene
Term
incomplete dominance
Definition
when both alleles for a trait are expressed in heterozygous individual
Term
codominance
Definition
whn an individual displays a trait that is intermidiate between the two parents
Term
dihybrid cross
Definition
a cross that considers 2 pairs of contrasting traits
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