Give examples of gene interaction.

As an example of gene interaction, consider how flower color is inherited in some plants. In the cells of the corolla of sweet pea, a certain substance is synthesized, the so-called propigment, which, under the action of a special enzyme, can turn into an anthocyanin pigment, which causes the purple color of the flower. This means that the presence of color depends on the normal functioning of at least two genes, one of which is responsible for the synthesis of propigment, and the other for synthesis of the enzyme. Violation of any of these genes in the work will lead to a violation of the synthesis of pigment and, as a consequence, to the lack of color; while the whisk of the flowers will be white. Sometimes the opposite situation occurs, when one gene affects the development of several signs and properties of the body. This phenomenon is called pleiotropy or multiple gene action. As a rule, this action is caused by genes, the functioning of which is very important in the early stages of ontogenesis. In humans, a gene involved in the formation of connective tissue can serve as an example. Violation of his work leads to the development of several symptoms at once (Marfan syndrome): long “spider” fingers, very high growth due to a strong lengthening of the limbs, high mobility of the joints, violation of the structure of the lens and aneurysm (protrusion of the wall) of the aorta.

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