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Heredity and Hormones 1
Heredity and Hormones:
Influence on Human Behavior
Your Name Here
AXIA College of the University of Phoenix
BEH 225
Instructor, Name Here
Month and Day

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Heredity and Hormones 2
Influence: Heredity and Hormones on Human Behavior
Debates on nature versus nurture are more likely to determine that genetics are the cause for
human behavior. Increasingly, researchers are directing attention on the cohesion of genes and
behavior; therefore, their tendency to follow a line of investigation on the influence of heredity
on human behavior increases the belief that genetics is a major issue that influences physical
behaviors. However, the lone fact of connection between genetics and behavior seems to be too
simplistic to describe the complex process of human behavior. The factor of hormones’
influence on behavior is additionally identified; which brings into debate the reality of behavior
being controlled exclusively by genetics.
The endocrine system, connected to most of the other core systems of the body, is
exceptionally active. The production and regulation of hormones is executed via the endocrine
system. Hormones are chemical “couriers” inside of the human body that are able to generate
particular reactions in cells or organs throughout a number of conflicting systems, thus
permitting the endocrine system to lead processes such as development, reproduction, and
behavior along with other systems. The glands produce hormones and a few organs spreading
into different regions of the body. According to Morris and Maisto (2002), the glands engaged in
hormone production are the gonads adrenal, pituitary, thyroid, pineal and parathyroid glands.
Additionally, the pancreas and various branches of the digestive tract are “role players” in the
production of certain hormones that when working together with glands affect many other
regions of the human body.
Genes deliver uniquely distinctive hereditary characteristics. Genes do exhibit effects to
behavior. Behavior is not ascribed to an isolated or “singular” gene or a conglomeration of
individual genes. Behaviors are complex and are attributed to various genes amid many other

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Heredity and Hormones 3
factors. Genetics are only partially responsible for our behaviors. As a complex attribute, both
genetic and environmental aspects affect behavior. Although the existence of specific hereditary
factors may boost or diminish the effects of others, when the genetic and environmental factors
act together they show the most effect on human behavior. Morris, P. (2000) shows his opinion
on how we have to understand the influence of both heredity and environment on human
behavior…”some traits are purely genetic, and these traits have a high heritability; other traits
are strongly influenced by the individual's environment, and their heritability is low; many traits
are produced by a complex mixture of genetics and environment”.
Two diverse fields illustrate the influence of heredity on human behavior. Behavior
genetics centers on demonstrating hereditary behavior from an individual point of view, while
evolutionary psychology is a study of “the evolutionary roots of behaviors and mental processes
that all human beings share” (Morris and Maisto, 2002, p. 79). Behavior genetics channels us to
understand the relationship of genetics and environment. To observe this more clearly twin
studies are conducted to confirm environmental differences between separated twins. “Kamin
and Goldberger (2002) questioned the validity of heritability estimates based on this method
because of concerns over the representativeness of samples. Are the results of studies of twins
generalizable to the general population? Do twins live in unique circumstances and receive
special treatment from others because they are twins?” (Jang, 2005, p. 9)
Evolutionary psychology is a science that explains why humans behave the way they do.
What is Evolutionary Psychology? (1996) explains that the science’s effort to find the common
roots of our inherited behavior and common behavioral roots are clearly visible today between
different cultures.
I believe that genes have an obvious and very important influence in creating our human

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