Chapter 4, Section 1

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Genetics
 
Term  
Definition

heredity

the passing of physical characteristics from parents to offspring

trait

each different form of a characteristic

genetics

the scientific study of heredity

fertilization

a new organism begins to form when egg and sperm join

purebred

the offspring of many generations that have the same trait

gene

factors that control a trait

alleles

different forms of a gene

dominant allele

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

recessive allele

trait that is hidden whenever the dominant allele is present

hybrid

organism has two different alleles for a trait