He started with 34 varieties of pea seeds in which he noticed 7 opposing characteristics among the plants. With this generation he bred a tall plant with a short plant by manually cross pollinating them. In result he noticed that all of the offspring were tall. In the text that follows, I will explain how genetic diversity takes place in cross breeding.
Essential Terms Remember that cells have pairs of chromosomes.
Each chromosome in a pair contains genes for the same characteristics. Thus in Mendel's pea plants each cell in the plants contained two chromosomes which each held a gene to determine whether the plant was tall or short. The genes on the chromosomes are called alleles. Each allele or gene is either dominant or recessive. A dominant allele will be used in transcription instead of the recessive allele.