| A | B |
|---|
| Law of Dominance | When an organism is hybrid for a pair of contrasting traits, only the dominant trait can be seen in the hybrid. |
| homozygous | containing two alleles that are the same (ex: tt or TT) |
| heterozygous | containing two alleles that are different (ex: Tt) |
| genotype | the genetic makeup of an organism (ex: Tt) |
| phenotype | the physical trait that an organism develops as a result of its genotype (ex: tall) |
| incomplete dominance | occurs when two alleles contribute to the phenotype;traits blend |
| codominance | both traits are expressed at the same time |
| dominant | a trait that masks another; represented by a capital letter |
| recessive | a trait that is only expressed in the homozygous form |
| heterozygous | Bb |
| heterozygous | one uppercase letter & one lowercase letter |
| homozygous dominant | two capital letters |
| homozygous recessive | bb |
| homozygous recessive | two lowercase letters |
| monohybrid | crossing of one trait |
| dihybrid | crossing of two traits |
| incomplete dominance | BB' |
| co-domianance | BW |
| complete dominance | Bb |
| genotype of a male | XY |
| genotype of a female | XX |
| sex linked trait | A trait genetically determined by an allele located on the sex chromosome |
| x linked sex linked trait | A trait that is determined by the allele on X chromosome |
| y linked sex linked trait | A trait determined by the allele on Y chromosome is said to be Y-linked. |
| x linked sex linked (male) | X^C y |
