Life on Earth

Chapter 13
Patterns of Inheritance
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Gregor Mendel and the Origin of Genetics
  • Doing it right: The secrets of mendel's success.

    Inheritance of Single Traits: The Law of Segregation
  • The inheritance of dominant and recessive alleles on homologous chromosomes can explain the results of mendel's monohybrid crosses.
  • Mendel's hypothesis can be used to predict the outcome of new types of single-trait crosses.

    Inheritance of Multiple Traits: Independent Assortment

    Inheritance Patterns of Genes Located on the Same Chromosome
  • Genes on the same chromosome tend to be inherited together.
  • Crossing over may separate linked genes.
  • The frequency of crossing over between linked genes can be used to map the location of genes on a chromosome.

    The Inheritance of Sex and Sex-Linked Genes
  • Sex linkage is a special case of linkage between genes on the same chromosome.

    Variations on the Mendelian Theme
  • In incomplete dominance, the phenotype of heterozygotes is intermediate between the phenotypes of the homozygotes.
  • There may be multiple alleles of a single gene.
  • Many traits are influenced by several genes.
  • A single gene may have multiple effects on phenotype.
  • The environment influences the expression of all genes.

    The Molecular Basis of Mendelian Genetics

    Reflections on Genetic Diversity and Human Welfare



  • PH Sower © 1997 by Prentice-Hall, Inc.
    Simon & Schuster/A Viacom Company
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