| A | B |
|---|
| organelle | structure found in the cytoplasm of cells |
| chromosome | stringlike structure in a cell that carries information controlling all the cell's activities |
| mitosis | process by which a cell produces two nuclei |
| asexual reproduction | reproduction by one parent |
| sexual reproduction | reproduction by two parents |
| sex cell | type of cell produced by organisms that reproduce sexually |
| meiosis | process by which sex cells form |
| fertilization | the joining of an egg cell and a sperm cell during sexual reproduction |
| zygote | the first cell of an offspring, formed when an egg cell and a sperm cell join |
| trait | a characteristic of an organism |
| heredity | the process that results in offspring resembling their parents |
| gene | a unit of DNA on a chromosome that controls a trait |
| inherit | receive from one's mother or father |
| mutation | a change in the DNA of a gene |
| dominant gene | a gene that prevents the expression of another gene |
| recessive gene | a gene whose expression is prevented by a dominant gene |
| purebred | an organism with either two dominant or two recessive genes for a trait |
| hybrid | an organism with one dominant and one recessive gene for a trait |
