| A | B |
|---|
| 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 |
| mutation | a change of DNA of a gene |
| fertilization | the joining of an egg cell and and a sperm cell |
| zygote | the first cell of an offspring, formed when an egg cell and a sperm cel join |
| sexual reproduction | the creation of a new organisms by two parents |
| sex cell | type of cell produced by organisms that reproduce sexually |
| meiosis | process by which sex cells form |
| mitosis | process by which a cell produces two new nuclei |
| organelle | a structure found in the cytoplasm of a cell |
| chromosome | stringlike structure in a cell that carries information controlling all the cell's activities |
| 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 |
| asexual reproduction | the creation of a new organism by one parent |
