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Heredity
The passing of physical characteristics from parents to offspring.
Trait
A different form of characteristic from one thing to another.
Genetics
The scientific study of heredity.
Fertilization
When male and female reproductive cells combine to create new organisms.
Purebred
A purebred organism is the offspring of many generations that have the same trait.
Gene
Factors that control a trait.
Alleles
A different form of a gene.
Dominant Allele
A dominant allele is one whose trait always shows up in the organism when the allele is present.
Recessive Allele
A recessive allele is one whose trait is hidden when the dominant allele is present.
Hybrid
A hybrid organism has two different alleles of a trait.