Within this section, the learner will:

  • Describe the structure of DNA
  • Describe how dominant and recessive alleles determine which traits organisms exhibit

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Test Your Understanding

Use your knowledge of cells and DNA to complete the concept map

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Choose the statement that correctly describes the forms alleles may take on a chromosome.
Read the description for common traits in the data table.Determine your phenotype and possible genotype. Heterozygous alleles make it impossible to know your exact genotype for a dominant trait.
Type your answers into the following input field(s). Type the phenotype then add a comma followed by the genotype. Your answer should look like this: phenotype, genotype

Facial Dimples
Bent little finger
Eye Color