| A | B |
|---|
| homozygous | two genes that are exactly the same for the same trait (TT tt) |
| heterozygous | a pair of genes for the same trait but are different from each other (Tt) |
| dominant | a gene that is strong enough to hide another gene |
| recessive | a gene that is weaker and can be hidden |
| genotype | a pair of genes for a certain trait |
| phenotype | a description of the physical appearance of an organism for one trait |
| pea plant | the type of plant Mendel researched |
| what part of the plant is a pea? | seed |
| stamen | the male organ of a plant |
| anther | the part of the plant that produces sperm cells |
| fruit | the ripened ovary of a flower; contain seeds |
| pistil | female organ of a plant |
| pollination | pollen landing on a pistil |
| stigma | the top of a pistil where pollen lands |
| ovary | the part of a flower that produces eggs |
| When did Mendel do his important work? | 1860's |
| allele | one possible form of a gene |
| Punnett square | a chart that shows possible combinations of genes |
| probability | the chances that a particular event will occur |
| gene | a hereditary factor passed from one generation to the next |
| two | the number of genes for each trait |
