Lecture 2: mendelian genetics for single gene traits. Can examine large numbers of offspring (understanding frequencies) Can self-fertilize: quick and easy to make pure-breeding/inbred lines, genetically homogeneous lines that show the same characteristics, generation after generation. Possess a number of simple" discrete, single gene traits (not continuous, complex inheritance) variable traits that can be clearly recorded. Seven phenotypic pairs studied by mendel were pea shape, pea colour, petal colours, pod shape, pod colour, height of stems and location of flowers on stem. One of the two traits in an antagonist pair was dominant and would always be manifest in the hybrid. Reciprocal crosses revealed that not only were traits dominant but also that this was independent of the parent it is immaterial to the form of the hybrid which of the parental types are used in the cross . Yellow pea (pollen) x green pea (eggs)= all yellow (self-fertilized)=yellow and green: reappearance of recessive trait disproves blending, uniparental inheritance.