| A | B |
|---|
| homozygous | an organism that has the same gene; purebred. Eg. BB or bb |
| heterozygous | an organism that has both a recessive and dominant gene; hybrid. Eg. Bb |
| allele | each member of a gene pair |
| mitosis | duplication and division of the nucleus and the chromosomes during cell reproduction |
| meiosis | process that results in cells with only half the normal number of chromosomes |
| trait | characteristic of an organism |
| sex-linked trait | traits passed from parent to child on a sex chromosome; eg. colorblindness |
| hemophilia | an inherited disease that causes the blood to clot slowly or not at all |
| colorblindness | an inhenrited disease; can't see red or green colors |
| nondisjunction | Chromosomes fail to separate; body cells have either extra or fewer chromosomes than normal. |
| Down Syndrome | have an extra chromosome on the 21st pair of chromosome; mental retardation |
| amniocentesis | take fluid from the surrounding of a baby inside a mother's body |
