Chapter 9 Essay

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Chapter 9 1. What is developmental psychology all about? The patterns of your life story, and the life stories of countless other people are the focus of developmental psychology- the study how people change physically, mentally, and socially throughout the lifespan. 2. What is the difference between genotype and phenotype? Genotype: the genetic makeup of an individual organism. 352 Phenotype: the observable traits or characteristics of an organism as determined by the interaction of genetics and environment factors. 354 3. What kind of visual system are infants born with respect to the other senses (i.e., is the visual system good or not)? 4. Do infants prefer sweet or sour tastes? 5. Humans have how many pairs of chromosomes? Humans have 23 pairs of chromosomes that represent your unique genotype. pg 353 6. What are chromosomes? Chromosomes are a long, threadlike structure composed of twisted parallel strands of DNA; found in the cell nucleus pg 352 7. What are genes and how do they differ from chromosomes? Genes are a unit of DNA on a chromosome that encodes instructions; the chemical basis of heredity. Each chromosome contains thousands of genes, and each gene is a unit of DNA instructions for making a particular protein molecule. Matched sets of chromosomes provides you with two copies of each gene. Dramactic differences in body and brain cells are due to which genes are “expressed” or activated. Genes make up less than 2% of human DNA. pg 352 8. Define each of the following terms: Conception- when chromosomes of the biological mother and father combine to form a single cell –the fertilized egg or zygote. pg 355 Zygote- the single cell formed at contraception from the union of the egg cell and the sperm cell pg 352 Germinal

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