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Creative Use of Vocab Chapter 3
3.1 & 3.2
17
Science
7th Grade
01/31/2012

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Term
Heredity
Definition
The passing of physical characterisitics from parents to offspring.
Term
Trait
Definition
Each different form of a characterisitc.
Term
Genetics
Definition
The scientific study of heredity.
Term
Fertilization
Definition
The process of an egg and sperm joining together.
Term
Purebred
Definition
The offspring of many generations that have the same trait.
Term
Gene
Definition
The factors that control a trait.
Term
Alleles
Definition
The different forms of a gene.
Term
Dominant Allele
Definition
One whose trait always shows up in the organism when the allele is present.
Term
Recessive Allele
Definition
One whose trait is hidden whenever the dominant allele is present.
Term
Hybrid
Definition
An organism that has two different alleles for a trait.
Term
Probability
Definition
A number that describes how likely it is that an event will occur.
Term
Punnett Square
Definition
A chart that shows all the possible combinations of alleles that can result from a genetic cross.
Term
Phenotype
Definition
An organisms physical appearance, or visible traits.
Term
Genotype
Definition
An organisms genetic makeup, or allele combinations.
Term
Homozygous
Definition
An organism that has two identical alleles for a trait.
Term
Heterozygous
Definition
An organism that has two different alleles for a trait.
Term
Codominance
Definition
The alleles are neither dominant or recessive, both alleles are expressed in the offspring.
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