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Chapter 2
Science ~ Chapter 2 Test ~ Science
19
Science
6th Grade
01/28/2011

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Term
The process by which a cell produces two new nuclei
Definition
Mitosis
Term
The dividing of a cell following mitosis
Definition
Cell division
Term
Reproduction by one parent
Definition
Asexual Reproduction
Term
Reproduction by two parents
Definition
Sexual Reproduction
Term
A type of cell produced only by an organism that reproduces sexually
Definition
Sex Cell
Term
The process by which sex cells form
Definition
meiosis
Term
The joining of and egg cell and a sperm cell during sexual reproduction
Definition
Fertilization
Term
The first cell of an offspring, formed when an egg cell and a sperm cell join
Definition
Zygote
Term
A characteristic of an organism
Definition
Trait
Term
The molecule in each cell that directs the cell's activities
Definition
DNA
Term
A section of DNA on a chromosome that controls a trait
Definition
Gene
Term
One kind of molecule that makes up a DNA strand
Definition
Base
Term
The process by which traits are passed from parents to offspring
Definition
Heredity
Term
To receive from one's mother or father
Definition
Inherit
Term
A gene that prevents the expression of another gene
Definition
Dominant Gene
Term
A gene whose expression is hidden by a dominant gene
Definition
Recessive Gene
Term
An organism with two dominant or two recessive genes for a trait
Definition
Purebred
Term
An organism that has one dominant and one recessive gene for a trait
Definition
Hybrid
Term
A permanent change in DNA that occurs when DNA copies itself
Definition
Mutation
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