Heredity And Environment
Some Relationship Between Heredity And Environment that produce the dark coloring function best at temperatures below the normal body temperature of the cat. .. (Explains why the discovery of DNA is important to modern day science). Statement That Best Describes The Relationship Between Heredity and system allowing both genetics and environment to work together to achieve a perfect. This chapter describes the different aspects of the abilities in relation to race and that the presence of the gene in relatives can be accurately inferred, and that . to be incorrect is contained in the statement that "because the effect of heredity .
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.
Heredity Versus Environment | btcmu.info
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. The different treatment had little effect on the basenjis and terriers but a lot on the beagles and shelties. Some of the differences were in the opposite direction for these breeds.
Effects of Heredity and Environment on our Personality
For example, adult indulged beagles became rather wary of humans whereas the disciplined beagles acted normally. In contrast, the indulged shelties acted normally, whereas the disciplined ones were very quiet and unresponsive. In each chromosome there are innumerable genes. These genes are the real determiners of hereditary characteristics—which pass on from one generation to the other. At the time of conception, the genes from chromosomes of both the father and the mother fuse together and determine the traits of the offspring to be born.
The physical characteristics such as height, weight, colour of eye and skin, social and intellectual behaviour are determined by heredity. Differences in these characteristics are due to the change in the genes transmitted.
Fraternal twins also differ from each other, because they are born out of different genes. However, we find more resemblances in identical twins because they are born out of monozygotic. In simple terms environment means the society, the fields of society and even the whole world. Like heredity, environment also has been found to play a very important role in determining the behaviour and personality development of an individual.
The environmental influences are those which act upon the organism at the earlier stages of development, i. Environment includes all the extrinsic forces, influences and conditions which affect the life, nature, behaviour, the growth, development and maturation of living organism Douglass and Holland.
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Hence, we can say that environment means all that is found around the individual. The cytoplasm is an intracellular environment which influences the development.
Though the life begins with single cell, in the process of cell division several new cells are formed and a new internal environment comes into existence. As the fetus develops the endocrine glands are formed.
The hormonal secretion by these glands gives rise to another intracellular environment.
Hormones are necessary for normal development, but defects in hormone secretion like over or under secretion may lead to congenital deformities. The growing embryo is surrounded by amniotic fluid in the uterus which creates another environment. This fluid will provide the necessary warmth and protection against the dangers due to organisms and other chemical effects on fetus.
The fetus is also connected to the mother by the umbilical cord, through which the nourishment is supplied. Sufficient nourishment is necessary from the mother. Otherwise the child will suffer from malnutrition.
The defects in mother like drug or alcohol addiction, smoking, malnutrition, diabetes, endocrinal disturbances, small uterus and such other problems cause many problems in child. The psychological state of mother like over excitement, depression also may cause damaging effect on the child. After nine months, the child is born and enters a new environment which is entirely different. A new life begins in a new environment. This new environment will have a different culture, ideology, values, etc.
The home atmosphere, parental love and affection, association with sibling, neighbours, peers, teachers, etc.