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Chapter 4

Chapter 4. Heredity and Evolution. Epigenetics. http://video.pbs.org/video/1525107473 / LA Times Article. Gregor Mendel. A monk living in what is now the Czech Republic Living in an abbey he crossed different strains of purebred plants and studied their progeny.

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Chapter 4

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  1. Chapter 4 Heredity and Evolution

  2. Epigenetics • http://video.pbs.org/video/1525107473/ • LA Times Article

  3. Gregor Mendel • A monk living in what is now the Czech Republic • Living in an abbey he crossed different strains of purebred plants and studied their progeny. • His work illustrates the basic rules of inheritance.

  4. Traits Mendel Studied in Peas

  5. Dominance • Dominant traits are governed by an allele that can be expressed in the presence of another, different allele. • Dominant alleles prevent the expression of recessive alleles in heterozygotes.

  6. Recessiveness • Recessive traits are not expressed in heterozygotes. • For a recessive allele to be expressed, there must be two copies of the allele.

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