Question

Pedigree charts use shaded symbols to show organisms that have a particular trait, such as a defective gene, being traced in the chart. A breeder wants to make a pedigree chart of male horses to avoid breeding males that have a defective gene. What symbol would the horse breeder use to show a male who is affected by a defective gene?

A. shaded circle
B. shaded square
C. unshaded circle
D. unshaded square