| A | B |
|---|
| Sperm cells contain chromosomes named | XY |
| Egg cells contain chromosomes named | XX |
| Scientist who studied pea plant heredity | G. Mendel |
| Purebred | Genotype TT or tt |
| Hybrid | Genotype Tt |
| Base A always combines with | Base T |
| Base G always combines with | Base C |
| The way an organism "LOOKS" | phenotype |
| A gene that "Covers up" another gene expression | dominant |
| Genes are located on these structures inside the nucleus of a cell | chromosomes |
| The "sex" of an organism is determined by the ___ | father |
| "sex-linked" genes are located on this chromosome | X |
| The blending of genes to express a trait | incomplete dominance |
| another term for purebred | homozygous |
| another term for hybrid | heterozygous |
| an organism that has a recessive gene for a trait, but doesn't show it | carrier |
| A normal human being has how many pairs of chromosomes | 23 |
| The last pair of chromosomes in a karyotype are the ____ | sex chromosomes |
| A short section of a chromosome | gene |
| How many different nitrogenous bases are found in DNA? | 4 |
