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Chapter 3

Chapter 3. Genetics. Michael Hoerger. The Basics. Nucleus: where most genetic material is stored, contains chromosomes Chromosomes: 46 (23 pairs), carry genes Genes: Segments on chromosomes, instruct cells how to make proteins DNA: basic molecules of genes See diagram: p. 60. Zygotes.

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Chapter 3

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  1. Chapter 3 Genetics Michael Hoerger

  2. The Basics • Nucleus: where most genetic material is stored, contains chromosomes • Chromosomes: 46 (23 pairs), carry genes • Genes: Segments on chromosomes, instruct cells how to make proteins • DNA: basic molecules of genes • See diagram: p. 60

  3. Zygotes • Zygote: single cell resulting from fertilization • Monozygotic (identical) twins: originate from the same zygote, same DNA • Dizygotic (fraternal) twins: originate from separate zygotes as a result of two ova available for fertilization, share about 50% of DNA (like any sibling)

  4. Types of Genes • Structural Genes: code for proteins that help determine traits • Regulatory Sequences: the “genetic switches” that influence when/where genes are expressed

  5. Stephen Jay Gould Video • What was Gould’s“great tragedy”? • Questions?

  6. Michael Hoerger To cite this textbook: • Berger, K. (2005). The developing person through the lifespan. New York: Worth. To cite this lecture: • Hoerger, M. (2007, January 17). Developmental Psychology: Genetics. Presented at a PSY 220 lecture at Central Michigan University.

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