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Ch 9 genetics
Section 2
14
Biology
9th Grade
05/12/2013

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Term
codominance
Definition
an inheritance relationship in which neither of 2 alleles of the same gene totally masks the other
Term
complete dominance
Definition
an inheritance relationship in which one allele is completely dominant over the other;
Term
dihybrid cross
Definition
a cross between individuals that involves the pairing of contrasting traits
Term
genotype
Definition
the genetic makeup of an organism
Term
genotypic ratio
Definition
the probable ratio of genotypes produced by a cross
Term
heterozygous
Definition
referring to a gene pair in which two alleles do not code for the same trait
Term
homozygous
Definition
referring to a gene pair in which the two alleles code for the same trait
Term
incomplete dominance
Definition
an inheritance relationship that occurs when both alleles influence the phenotype
Term
monohybrid cross
Definition
a cross between individuals that involves one pair of contrasting traits
Term
phenotype
Definition
the external appearance of an organism that is determined by the individual's genotype
Term
phenotypic ratio
Definition
the ratio of the offsprings' phenotypes
Term
probability
Definition
the number of times an event is expected to happen divided by the number of opportunities for an event to happen
Term
punnett square
Definition
a model used to establish the probabilities of the results of a genetic cross
Term
test cross
Definition
crossing of an individual of unknown genotype with a homozygous recessive individual to determine the unknown genotype
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