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Ap Human Genetics Chapter 4 Summary

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Chapter 4 Summary Genes are what makes up who we are as people; they define us. DNA consists of smaller pieces known as genes. Every living human has received genes from both their mother and father to make up their entire DNA. We also possess instructions for making up ourselves as an organism, known as genomes. But what about twins? When an egg splits into two that is what makes identical twins and two babies coming from different eggs creates fraternal twins. Identical twins share more similarities not only in their physical appearance but other ways as well. Adoption is another question many face. Studies have concluded that adoptees resemble more to their biological relatives instead of their adopted family. Genes leave many curious …show more content…
Natural selection has a huge role in sexual and mating preferences. Traits that will be successful in the future have the best chance of moving on to the next generation; this is because of natural selection. As most say, your experiences during childhood affect your brain; this is true. Life experiences modify your brain into the person you are today. But it doesn’t stop at childhood. This occurs constantly.
What some don’t realize is culture has a major influence on our behavior. The sports played, how we eat, what we eat, and our other ways of life affect our behavior. The world today has a wide variety of cultures all over. All these different cultures are what create such diversity. Males and females have many similarities and differences. Males tend to show more aggression, express more support in war, and boys like to be involved in larger groups. Females are known to receive a lower paying salary, play in small groups, and show more interest in people instead of things.
Our sex is determined by the X chromosomes received from the mother and the Y chromosomes received from the father. Gender is important by making up another part of who we are. The development of the world and humans as a species over time has formed us into who we are today. Science helps us piece this all together to help grasp who we are and

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