Carolyn N. Kinder
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Identical
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Twin Pairs
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Fraternal
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Twin Pairs
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|
Agree
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Disagree
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Agree
|
Disagree
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Type of Blood
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125
|
0
|
60
|
31
|
|
Group
|
|
Susceptibility
|
68
|
29
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45
|
99
|
to Tuberculosis
The contrast in Agreement and Disagreement between the Members of Twin Pairs, Identical and Fraternal; for the Blood Group and Susceptibility to Tuberculosis.
Genetic Disorders
Multifactorial disorders arise from the action of at least several genes and their interaction with the environment. Heart disease, which is one of the leading cause of death in the United States today. This disease has been linked with smoking, diets high in cholesterol and saturated animal fats, stress, and lack of exercise. It is not clear that dietary control is a practical solution to the problem. If the difficulties of overcoming one’s genotype by dietary manipulations are too great, the program will have little effect. Unfortunately, we do not know how strong the control of the genotype may be.
There appears to be a genetic predisposition to hypertension (high blood pressure), which also is associated with heart disease. Hypertension is easy to diagnose and usually can be controlled by drugs, diet, and exercise. Awareness of the genetic predisposition to many common, multifactorial disorders and knowledge of your own hereditary history can help you make sound life style choices.
The chromosomes in our cells are not affected by any change that takes place within our body cells. This means that no change that we make in ourselves or that is made in us in our lifetimes can be passed on to our children through the process of biological heredity. Such changes made in a acquired characteristics.
Cancer is another type of genetic disorder. A cancer is a clone of cells growing without normal morphogenetic controls in a living host. In man, the difficulty arises because for common cancers we also always expect and find important environmental factors involved in their onset.