Science Vocabulary ~ Chapter 4

Organelle that controls all the activities of a cell and contains hereditary material made of proteins and DNA.

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).

Structure in a cell's nucleus that contains hereditary material.

A type of reproduction- fission, budding, and regeneration- in which a new organism is produced from one organism and has DNA identical to the parent organism.

Any living thing; uses energy, is made of cells, reproduces, responds, grows, and develops.

A type of reproduction in which two sex cells, usually an egg and a sperm, join to form a zygote, which will form into a new organism with a unique identity.

Haploid sex cell formed in the male reproductive organs.

Haploid sex cell formed in the female reproductive organs.

In sexual reproduction, the joining of the sperm and the egg.

New diploid cell formed when a sperm fertilizes an egg; will divide by mitosis and develop into a new organism.

Cell whose similar chromosomes occur in pairs.

Cell that has half the number of chromosomes as body cells.

Reproductive process that produces four haploid sex cells from one diploid cell and ensures offspring will have the same number of chromosomes as the parent organisms.

The passing of traits from parents to offspring.

Deoxyribonucleic acid; the genetic material of all organisms; made up of two twisted strands of sugar phosphate molecules and nitrogen bases.

Section of DNA on a chromosome that contains instructions for making specific proteins.

Ribonucleic acid; a type of nucleic acid that carries codes for making proteins from the nucleus to the ribosomes.

Any permanent change in a gene or chromosome of a cell; may be beneficial, harmful, or have little effect on the organism.