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Multiple Alleles

A gene that has more than one allele

Sex Chromosomes

Carry genes that determine whether a person is a male or a female

Sex-linked genes

Genes on the X and Y chromosomes


A person who has one recessive allele for a trait and a dominant allele

Genetic Disorder

An abnormal condition that a person inherits through genes or chromosomes


chart or "family tree" that tracks which members of the family have a particular trait


A picture of all the chromosomes in one cell

Selective breeding

The process of selecting organisms with desired traits to be parents of the next generation


The technique that involves crossing two individuals that have similar characteristics


Breeders cross two genetically different individuals


An organism that has exactly the same genes as the organism it was produced from

Genetic engineering

Genes from one organism are transferred into the DNA of another organism

Gene therapy

Inserting copies of a gene directly into a person's cell


is all the DNA in one cell of an organism

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