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heredity

the passing of traits from parents to offspring

genetics

The scientific study of heredity

trait

specific characteristic that varies from one individual to another

allele

one of a number of different forms of a gene

purebred

the offspring of many generations that have the same traits

hybrid

offspring of crosses between parents with different traits

dominant

trait that will show up in an organism's phenotype if gene is present

recessive

The inherited characteristic often masked by the dominant characteristic and not seen in an organism.

homozygous

having two identical alleles for a trait

genotype

genetic makeup of an organism

heterzygous

an organism in which two alleles for a particular trait are not identical

phenotype

physical characteristics of an organism

punnett square

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

sex linked gene

gene located on the X or Y chromosome

multiple allele

presence of more than two alleles for a genetic trait

pedigree

a diagram that shows the occurrence of a genetic trait in several generations of a family

mutation

change in a DNA sequence that affects genetic information

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