Contributions of genetics .. Sutton and Yofri. Mendel. Thomas Morgan. Henry Kleinfelter. Dawn

Scientists and their contributions to genetics:
1- Sutton and Evry (1902) set the foundations of chromosomal theory.
2- Mendel (1860 m), after conducting experiments on the plant of vegetable pea to the legal status of inheritance, namely:
Genetic isolation law.
- Law on the free distribution of genetic factors.
3- Thomas Morgan (1911):
- When studying the inheritance of traits in the Drosophila insect, he noted that there are only four pairs of chromosomes promising hundreds of genes, which means that each chromosome carries a number of genes.
- Assume that the association of genes to each other is due to its presence on the same chromosome and that the correlation between genes depends on the distance between adjacent genes on the chromosome.
- During his study of eye color in the Drosophila insect, he discovered that the genes of some physical traits are located on the sexual chromosomes Y-X, so he called them (gender-related traits).
4- Henry Kleinfelter (1942): The discovery of the case of Kleinfelter.
5- Dawn (1866): the discovery of Down's condition.
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