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Chapter 5: Heredity
na
15
Science
7th Grade
11/25/2008

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Term
Allele
Definition
An alternate form that a gene may have for a single trait.  Can be dominant or recessive.
Term
Dominant
Definition
Describes a trait that covers over, or dominates, another form of that trait.
Term
Genetic Engineering
Definition
Biological and chemical mthods to change the arrangement of a gene's DNA to improve crop production, produce large volumes of medicine, and change how cells perform their normal functions.
Term
Genetics
Definition
The study of how traits are inherited through the action of alleles.
Term
Genotype
Definition

The genetic makeup of an organism.

Term
Heredity
Definition
The passing of traits from parent to offspring.
Term
Heterozygous
Definition
Describes an organism with two different alleles for a trait.
Term
Homozygous
Definition
Describes an organism with two alleles that are the same for a trait.
Term
Hybrid
Definition
An offspring that was given different genetic information for a trait from each parent.
Term
incomplete dominance
Definition

Production of a phenotype that is intermediate between the two homozygous parents.

Term
phenotype
Definition
Outward physical appearance and behavior of an organism as a result of its genotype.
Term
Polygenic Inheritance
Definition
Occurs when a group of gene pairs acts together and produces a specific trait, such as human eye color, skin color, or height.
Term
Punnett Square
Definition
A tool used to predict the probability of certain traits in offspring that shows the different ways alleles can combine.
Term
Recessive
Definition
Describes a trait that is covered over, or dominated, by another form of that trait and seems to disappear.
Term
Sex-linked gene
Definition
An allele inherited on a sex chromosome and that can cause human genetic disorders such as color blindness and hemophilia.
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