Heredity

Projects

Punnet Square I
Punnet Square II

Punnet Square III
Making Babies

Family Pedigree with Traits
Traits Lab
Mapping Traits
Vocabulary
Protein Synthesis

Genetic SLC
DNA Replication

Protein Synthesis
DNA Fingerprinting

Heredity Facts

Student Objectives
Heredity
Mendel
Principle of Segregation
Principle of Independent Assortment
In search of the gene.

Genetics Sites

Human Genome Project
DNA Learning Center
MendelWeb

References

Henderson's Dictionary of Biological Terms. 10th Ed. John Wiley & Sons.


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Heredity



Heredity

Before the development of genetics, our understanding of heredity came from farming, agriculture, and the breeding of animals, such as dogs, for certain desirable traits. Many breeds of dogs, for example, were developed during the Middle Ages. In the 1790s, the British farmer T.A. Knight bred varieties of garden peas. In his work, he noticed that everytime he bred peas with white flowers to those with violet flowers, the offspring were always violet. Knight explained this phenomena by stating that the violet flowers had a "stronger tendency" to appear than white flowers. The idea of a trait having a "stronger tendency" appeared up to the 18th century in phrases that people used, such as "its in the blood", to account for certain traits that appeared quite often in certain families.

But in the 19th the field of Genetics because of the work of an Austrian named Gregor Mendel. Mendel, through his understanding of both science and mathematics, developed the foundations from which Genetics grew. Mendel learned how to predict the probability that future traits would appeared, based upon knowing what traits and genes that the parents possessed.