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Chapter 4
Cell Reproduction
15
Science
7th Grade
10/24/2006

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Term
ASEXUAL REPRODUCTION
Definition
A type of reproduction in which a new organism is produced from one organism and has DNA identical to the parent; Known as fission, budding or regeneration
Term
CHROMOSOME
Definition
structure in a cell's nucleus that contains hereditary material
Term
DIPLOID
Definition
cell whose similar chromosomes occur in pairs
Term
DNA
Definition
deoxyribonucleic acid; the genetic material of all organisms; made up of two twisted strands of sugar-phosphate molecules and nitrogen bases
Term
EGG
Definition
haploid sex cell formed in the female reproductive organs
Term
FERTILIZATION
Definition
in sexual reproduction, the joining of a sperm and egg
Term
GENE
Definition
section of DNA on a chromosome that contains instructions for making specific proteins
Term
HAPLOID
Definition
a cell that has half the number of chromosomes as body cells
Term
MEIOSIS
Definition
reprodcutive process that produces four haploid sex cells from one diploid cell and ensures offspring will have the same number of chromosomes as the parent
Term
MITOSIS
Definition
cell process in which the nucleus divides to form two nuclei identical to each other and identical to the original nucleus, in a series of steps (prophase, metaphase, anaphase, and telophase)
Term
MUTATION
Definition
any permanenet change in a gene or chromosome of a cell; may be beneficial, harmful, or have little effect on an organism
Term
RNA
Definition
ribonucleic acid; a type of nucleic acid that carries codes for making proteins from the nucleus to the ribosomes
Term
SEXUAL REPRODUCTION
Definition
a type of reproduction in which two sex cells, usually an egg and a sperm, join to form a zygote, which will develop into a new organism with a unique identity
Term
SPERM
Definition
haploid sex cell formed in the male reproductive organs; in humans, male reproductive cells produced in the testes
Term
ZYGOTE
Definition
a new diploid cell formed when a sperm fertilizes an egg; will divide by mitosis and develop into a new organism
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