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A number that describes how likely it is that an event will occur.

Punnett square

A chart that shows all the possible combinations of alleles that can result from a genetic cross.


An organism's physical appearance, or visible traits.


An organism's genetic makeup, or allele combinations.


Having two identical alleles for a trait.


Having two different alleles for a trait.


A condition in which neither of two alleles of a genen is dominant or recessive.

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