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The passing of physical characteristics from parents to offspring


Each different form of a characteristic, such as stem height or seed color


Scientific study of heredity


When a new organism begins to form when egg and sperm cells join together


The offspring of many generations that have the same form of a trait


Factors that control a trait (contains 2 alleles)


The different forms of a gene

Dominant Allele

One whose trait always shows up in the organism when the allele is present

Recessive Allele

Hidden whenever the dominant allele is present


An organism that has 2 different alleles for a trait


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

Punnett Square

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


An organism that has 2 identical alleles for a trait (purebred)


An organism that has 2 different alleles for a trait (hybrid)


When both alleles for a gene are expressed equally

Incomplete Dominance

When one allele is only partially dominant

Polygenic Inheritance

When more than one gene affects a trait

Inherited Trait

Trait someone is born with

Acquired Trait

Trait that is caused by physical action (environment)

Not born with it


Process by which the number of chromosomes is reduced by half to form sex cells- sperm and eggs

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