Mendelian Genetics
       
            1862                                  1868                            1880

Genetic Terminology:

    * Trait - any characteristic that can be passed from parent to offspring
    * Heredity - passing of traits from parent to offspring
    * Genetics - study of heredity
    * Alleles - two forms of a gene (dominant & recessive)
    * Dominant - stronger of two genes expressed in the hybrid; represented by a capital letter (R)
    * Recessive - gene that shows up less often in a cross; represented by a lowercase letter (r)
    * Genotype - gene combination for a trait (e.g. RR, Rr, rr)
    * Phenotype - the physical feature resulting from a genotype (e.g. tall, short)
    * Homozygous genotype - gene combination involving 2 dominant or 2 recessive genes (e.g. RR or Rr); also called pure
    * Heterozygous genotype - gene combination of one dominant & one recessive allele    (e.g. Rr); also called hybrid
    * Monohybrid cross - cross involving a single trait
    * Dihybrid cross - cross involving two traits
    * Punnett Square - used to solve genetics problems