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Genotype
The genetic makeup of an organism
Phenotype
The physical characteristics of an organism
Testcross
A cross between an organism whose genotype for a certain trait is unknown and an organism that is homozygous recessive for that trait so the unknown genotype can be determined from that of the offspring
Monohybrid cross
A cross between two individuals, concentrating on only one trait
Dihybrid cross
A cross between two individuals, concentrating on two traits
Probability
The likelihood an event will occur
Punnett square
A diagram that shows the possible results of a genetic cross; parents' gametes on top and left, offsprings' genotypes inside
Ratio
The quantitative relationship between two amounts showing the number of times one value contains or is contained within the other; i.e three to 1 (3:1) or one to two to one (1:2:1)
Percentage
A part of a whole expressed in hundredths
Note 
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