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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

Chapter 3

Genetics

Michael Hoerger

the basics
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
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)
types of genes
Types of Genes
  • Structural Genes: code for proteins that help determine traits
  • Regulatory Sequences: the “genetic switches” that influence when/where genes are expressed
stephen jay gould video
Stephen Jay Gould Video
  • What was Gould’s“great tragedy”?
  • Questions?
slide7
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.