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Intro. to Genetics Vocab.
Basic Vocabulary for genetics
10
Biology
7th Grade
10/25/2011

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Term
Alleles
Definition
different forms of the same gene
Term
Genes
Definition
A unit of heredity that codes for a particular product; it is located on a chromosome.
Term
Dominant
Definition
If an organism has one of these alleles it will express the trait; written as a capital letter
Term
recessive
Definition
An allele that seems to disappear in the person; written as a lowercase letter
Term
phenotype
Definition
Physical appearance of an organism (Ex. Hair color)
Term
genotype
Definition
Genetic makeup of an organism; it’s on the “inside” and you can’t see it
Term
homozygous
Definition
When an organism has two alleles that are exactly the same
Term
heterozygous
Definition
When an organism has one dominant allele and one recessive allele
Term
hybrid
Definition
another name for heterozygous
Term
purebred
Definition
another name for homozygous
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