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Life on Earth
Chapter 15 Human Genetics |
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| At a Glance |
  
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- Methods in Human Genetics
- Single-Gene Inheritance
- Most human genetic disorders are determined by recessive alleles.
- A few human genetic disorders are determined by dominant alleles.
- Many human traits are either sex-linked or sex-influenced.
- Complex Inheritance
- Many human traits are influenced by many genes.
- The environment influences the expression of genes.
- Chromosomal Inheritance
- Some genetic disorders are caused by abnormal numbers of sex chromosomes.
- In humans, the Y chromosome determines maleness.
- Some genetic disorders are caused by abnormal numbers of autosomes.
- The Human Genome Project
- Medical genetics poses new medical and ethical dilemmas.
- Phenylketonuria illustrates a biomedical dilemma.
- Knowledge of human genetics poses ethical dilemmas.
- Most human genetic disorders are determined by recessive alleles.
