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Extensions of Mendelian Genetics
Chapter Concepts
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This list describes the topics presented in your textbook and that you'll explore in this section of the web site. Your first step might be to take the self-grading review quiz to test your knowledge but many other resources are also available to help you master the concepts. To begin, select from the menu of chapter resources to the left.
Concepts
- Alleles alter phenotypes in different ways
- Geneticists use a variety of symbols for alleles
- In incomplete, or partial, dominance, neither allele is dominant
- In codominance, the expression of both alleles in a heterozygote is clearly evident
- Multiple alleles of a gene may exist in a population
- Lethal alleles may be recessive or dominant
- Combination of two gene pairs involving two modes of inheritance modify the 9:3:3:1 ratio
- Phenotypes are often controlled by more than one gene
- Complementation analysis can determine whether or not two similar mutations are alleles
- X-Linkage describes genes on the X chromosome
- In sex-limited and sex-influenced inheritance, an individual's sex influences the phenotype
- Phenotypic expression is not always a direct reflection of the genotype
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