Chromosomes and Heredity

Objectives

When you have completed this section, you should be able to

  • describe the paired arrangement of chromosomes in the human karyotype;
  • define allele and discuss how alleles affect the traits of an individual; and
  • discuss the interaction of heredity and environment in producing individual traits.

Heredity is the transmission of genetic characteristics from parent to offspring. Several traits and diseases discussed in the forthcoming chapters are hereditary: baldness, blood types, color blindness, and hemophilia, for example. Thus it is appropriate at this point to lay the groundwork for these discussions by introducing a few basic principles of normal heredity. Hereditary defects are described in chapter 29 along with nonhereditary birth defects.

Saladin: Anatomy & I 4. Genetics and Cellular I Text I © The McGraw-Hill

Physiology: The Unity of Function Companies, 2003 Form and Function, Third Edition

146 Part One Organization of the Body

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