Section 2, pages 30-33. By Ivy Davis. The Tale of the Garden Pea: The Basis of Medelian Genetics.
By Ivy Davis
The scientific objective of Gregor Mendel’s pea plant study was to see how traits are transmitted over generations.
Another important decision Mendel made was to cross and follow individual plants that differ in only one trait over several generations.
Phenotype The physical or biochemical characteristics of an organism that result from the
reproducing species, (1)each chromosome inside the
nucleus of a cell is a large DNA molecule in which
many genes are located .
Each individual cell has a fixed number of chromosomes that is unique for that species. All chromosomes come in pairs.
The physical or biochemical characteristic controlled by the genotype is called its phenotype.
In each diploid somatic cell in humans, there are 46 chromosomes.
Mendel started out with only true breeding varieties. This is the P-parental generation.
During the time of Mendel’s experiments, most of these terms were not used by the scientific community. The only tool available for Mendel was an experimental protocol for test crossing true breeding plants and mathematical rules for predicting probability that could be used in analyzing data.