Meaning and Effects Article shared by: The Meaning of Heredity: The biological or psychological characteristics which are transmitted by the parents to their off-springs are known by the name of heredity.
Interaction of Heredity and Environment All traits Heredity evironment interactions both on genetic and environmental factors.
Heredity and environment interact to produce their effects. This means that the way genes act depends on the environment in which they act. In the same way, the effects of environment depend on the genes with which they work.
For example, people vary in height. Although height is highly heritableenvironmental variables can have a large impact. For example, Japanese-Americans are on the average taller and heavier than their second cousins who grew up in Japan, reflecting the effect of environmental variables, especially dietary differences.
Phenylketonuria PKU is an excellent example of environmental modification of a genetically controlled effect. The enzyme that breaks down phenylalanine is defective, so it accumulates and breaks down abnormally.
So in PKU, a single gene can dramatically affect behavior: But the effect of that defective gene expression depends on the environment in which it occurs.
When this abnormal metabolism of phenylalanine was discovered, an effective treatment became available: The abnormal gene is still there, but because little phenylalanine is present in the diet, little toxic effects result. This defective gene was no longer expressed in mental retardation, because the environment was different: The treatment for PKU illustrates the principle that the way a gene is expressed depends on the environment in which it is expressed.
This principle is called interaction of heredity and environment This is a critically important idea. It says that all traits depend on the environment in which they are expressed, even traits that are very strongly affected by genetics.
Conversely, all traits depend on the genotype on which they act, even traits that are very strongly affected by environmental differences. Another illustration of this idea is the effect of environments on genetically "maze bright" and "maze dull" rats see Exercise asgn1p.
These strains were selectively bred to learn a maze quickly or slowly. They turn out to differ in maze learning only if they grow up in a "normal" laboratory environment.
If they grow up in a very restricted environment, both kinds learn equally slowly. Half of two litters from four breeds basinji, beagle, sheltie, terrier are "indulged" twice daily; the other half are trained on obedience tasks.Start studying Chapter 3: Genes, Environment, and Development.
Learn vocabulary, terms, and more with flashcards, games, and other study tools. Gene-environment correlation (or genotype-environment correlation) is said to occur when exposure to environmental conditions depends on an individual's genotype Contents 1 Definition.
The field of research looking at gene-environment interactions (GxE) is growing. How do your genes and the environment interact? It is important to understand that most times your genes do not determine your health.
Small differences in your genetic makeup mean that two people can respond differently to . HEREDITY AND ENVIRONMENT The nature versus nurture controversy— that is, how much of our behavior is due to inherited factors and how much to environmental factors Heredity is the passing of traits to offspring (from its parent or ancestors).
This principle is called interaction of heredity and environment This is a critically important idea. It says that all traits depend on the environment in which they are expressed, even traits that are very strongly affected by genetics. To return to the exercise, close this browser window..
Interaction of Heredity and Environment. All traits depend both on genetic and environmental factors. Heredity and environment interact to produce their effects. This means that the way genes act depends on the environment in which they act.