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4.1 Key Terms
Living thing inherit traits in patterns.
8
Science
7th Grade
12/02/2008

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Term
sexual reproduction
Definition
When a cell from the mother and a cell from the father combine to become a new cell, which then becomes the offspring.
Term
gene
Definition
a unit of heredity found in a certain place on a chromosome and that codes for a certain product.
Term
heredity
Definition
The passing of genes from parents to offspring
Term
allele
Definition
Various forms of the same gene.
Term
phenotype
Definition
The actual characteritics an organism has.
Term
genotype
Definition
The genes an organism has.
Term
dominant
Definition
an allele that is expressed in the phenotype even if only one copy is in the genotype.
Term
recessive
Definition
An allele that is expressed in the phenotype only when two copies of it are present in the genotype.
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