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

4. 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)

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

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

7. 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.