| A | B |
|---|
| chromosomes | structures in the nucleus of the cell that control the cell's activities |
| fertilization | the joining of a sperm cell and an egg cell |
| fertilized egg | the cell that results when an egg cell and a sperm cell unite |
pollination,  | when pollen grains are moved from a stamen to the sticky top of the pistil |
| inherited | passed to offspring from parents |
| selective breeding | breeding plants or animals with certain traits to produce offspring with those traits |
| mutation | a permanent change in the structure of a gene or chromosome |
| recessive gene | a gene whose effect can be hidden |
| dominant gene | a gene that can prevent the expression of another gene |
| hybrid | an individual that has a dominant and recessive gene for a trait |
| gene | the section of a chromosome that controls a trait |
| numerator | the number above the line in a fraction |
| denominator | the number below the line in a fraction |
