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Heredity and Hormones - Running head Checkpoint Heredity...

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Running head: Checkpoint: Heredity and Hormones 1 Checkpoint: Heredity and Hormones Bonnie Giese BEH/225 October 21, 2010 Kathy Dorch
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Checkpoint: Heredity and Hormones 2 Checkpoint: Heredity and Hormones What role does heredity and hormones play when attempting to explain human behavior? One may be surprised to know that heredity and hormones are the main triggers for the way we act. “We are shaped by life experiences and how we react to those experiences can be traced back to hormones and our family histories. Both nature and how we were nurtured affect human behavior” (Hernandez, C., 2010). Genetics “Genetics is the study of how living matter passes down traits from one generation to the next” (Morris & Maisto, 2002, p. 79). Offspring are not an exact replica of their parents, but, there is scientific proof that certain material will pass down from parent to offspring for continuous generations (Morris & Maisto, 2002). This material that is passed down is called genes. Genes consist of genetic makeup called DNA. “Genes are carried by chromosomes which are tiny threadlike bodies found in the nucleus of all cells. Chromosomes vary in size and shape and usually come in pairs. Each species has a constant number: Mice have 20 pairs, monkeys have 27, and peas have 7. Human beings have 23 pairs of chromosomes in every normal cell. The exceptions are sex cells, which have only half a set of chromosomes. At fertilization, the chromosomes from the father’s sperm link to the chromosomes from the mother’s egg, creating a new cell called a zygote . That single cell and all of the billions of body cells that develop from it (except sperm and ova), contain 46 chromosomes, arranged as 23 pairs” (Morris & Maisto, 2002, p. 79).
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