Essay on The Science of the Sexes

Blum consulted University of California at Berkeley behavioral endocrinologist Marc Breedlove about how hormones contribute to gender differences. Breedlove’s studies support the idea that there are biological differences between males and females that distinguish each gender’s behavior. This suggests that it’s worthwhile to look at human evolution to understand why these biological differences exist – what is the purpose of masculinity and why do masculine traits such as aggression develop predominantly in males?

Stephen Jay Gould, a paleontologist and evolutionary scientist, in his essay “Women’s Brains” (1980), argues that previous claims about the intellectual superiority of men over women are based on misinterpreted experimental results and therefore hold no scientific significance.

The three primary arenas of research to explain biological differences between men and women are is the evolutionary theory, brain research, and endocrinological research. The evolutionary psychology declares an ability to explain psychological differences between women and men through their evolutionary trajectories (Kimmel 24). Therefore, women and man have not change

In her scientific work Sex Differences in the Brain Kimura analysis several key differences that cause men and women to excel in various tasks and jobs due to naturally occurring phenomenon in the body and

“Goy then went on to show that if you manipulate testosterone level – raising it in females, cutting it off in males – you reverse those effects, creating sweet little boy monkeys and rough-and-tumble girls. (Blum, 238)

     Biology too plays a major role in the differences between male and female. Genetically, there are differing chromosomes. XY for male and XX for female. These chromosome differences account for the physical differences that men and women have. In dealing with body composition, males are more likely to be taller and more muscular. Males also have testosterone, the male sex hormone. It is said that males with high levels are more confrontational and smile less. Women that have low levels of estrogen, the female sex hormone, are said to be more disagreeable and confrontational. Maybe because men have such a huge advantage over women by being physically larger, they are supposed to be more aggressive and women having less physical strength are supposed to be the nurturers.

Structural brain differences also occur in humans. One significant behavior difference is between men and women. Men tend to be more sexually aggressive and aroused more often. Women are generally more fluent verbally. The suprachiasmatic nucleus is usually about 2.5 larger in the male brain than the female brain and there is a part in the amygdala that is also larger (9). The suprachiasmatic nucleus affects sexual behavior and larger amounts of testosterone cause it to be larger. In females, the corpus callosum and the anterior commissure are larger (9). Both of these structures are responsible for communication between the two hemispheres in the brain. The better communication between the two sides leads to better verbal fluency. These examples show how small differences in the brain can greatly affect human behavior. This means that it is possible that criminals have differences in their brains which cause them to act in socially unacceptable ways.

Dr. Allen suggests that hormones make our brains different. Psychologists know the first one causes male sex characteristics, but the second one is still a mystery. An example is CAH girls, short for Congenital Aderinal

For example, females usually inherit an X chromosome form both parents. Social skills which are a typical female characteristics can be found in he x chromosome. From these findings it can be said that women are more comfortable in social settings. I can think of my husband in social settings where he does not know anyone he is less likely than me to introduce himself. I have no problem introducing myself and striking up a conversation with a stranger. Hormones also have an effect on gender determination. Men and women go through maturity as a result of hormones. Estrogen in women and Testosterone influence skills and tendencies associated with gender. Sex effects how the brain develops. According to our textbook, the force of biology is evident in cases where doctors try to change a child’s biological sex” (47). Doctors mistakenly amputated David’s penis to correct phimosis, a condition in which the foreskin of the penis interferes with urination. The child’s name was changed to Brenda and she did not take to being a girl. Later in life Brenda changed her name back into David and began living a life as a male eventually getting married and raising stepchildren. I believe that biological theory is accurate match for one’s gender.

Biologically, there are some differences between males and females. Boys do tend to be a bit more aggressive, while girls are usually more verbal. Males also have better spatial skills, which research seems to contribute to their higher testosterone levels, as women with higher testosterone also seem to have greater spatial reasoning skills. (Kimura 50).

The nineteenth century saw the start of the scientific debate in which brain size was presumed to indicate intelligence. Which in turn lead some scientists to the conclusion that men, having on average a larger brain size than women, may be more intelligent.

What does it take to be a man or a woman? Our sense organs alone do not determine whether we are men or women. Our gender includes a multifaceted combination of beliefs, behaviors, and characteristics. How do we act, behave, and talk like a man or a woman? Each one of us has a sex, a gender, and a gender identity that are all aspects of our sexuality. These aspects describe who we are, in different personalities and attributes but related. Society’s categories for what is masculine and feminine may not capture how we truly feel, how we behave, or how we define ourselves.

Studies have also been carried out into whether or not there are differences between male and female brain size and whether this affects how we relate to each other in terms of gender. Simon Baron-Cohen believes that male brains are wired towards systematic understanding and females are wired towards empathy. In addition he says that this is not necessarily always the case but the majority are wired in this way: “Both sexes have their strengths and weaknesses. Neither sex is superior overall.” (Baron-Cohen, S. 2003).

No one would argue the fact that men and women are physically different. The physical differences are rather obvious and most of these can be seen and measured easily. Men, who are essentially built for physical confrontation and the use of force, usually have greater upper body strength, build muscle easily, have thicker skin, and mostly use the left side of their brain. Women on the other hand, have a higher percentage of body fat, and a wider pelvis. Women also have four times as many brain cells connecting the right and left side of their brain. This provides physical evidence that supports the observation that men rely easily and more heavily on their left brain to solve one problem one step at

As evident from the generalized patterns found in differences in behaviour and outlook observed between the sexes, it may be tempting, as has been done in the past, to conclude that gender is an unavoidable aspect of human existence as determined purely from one 's genes. Indeed, human physiology is subject to sexual dimorphism; statistically significant differences in brain size and rate of maturation of specific substructures in the brain exist between males and females (Giedd, Castellanos, Rajapakese, Vaituzis, & Rapoport, 1997), yet these physical differences fail to explain how individuals form their concept of their own gender, and why they tend to conform to their perceived gender roles as defined by the society in which they live, when these roles are ever-changing. Thus, it is important to differentiate between the physical and nonphysical traits, and how the labels of femininity and masculinity should not confuse the two aspects. As defined by Unger (1979), “sex” would be used to refer to the biological differences in males and females, while “gender” describes socioculturally determined, nonphysiological traits which are arbitrarily designated as being appropriate for either females or males. With more recent awareness and interest in matters of gender nonconformity and individual gender identity, new research now explains how these concepts of gender are shaped by social influences (Perry