Chapter 4, Problem 7P

The wild-type color of horned beetles is black, although other colors are known. A black horned beetle from a pure-breeding strain is crossed to a pure-breeding green female beetle. All of their ${\text{F}}_{\text{1}}$ progeny are black. These ${\text{F}}_{\text{1}}$ are allowed to mate at random with one another, and $\text{320}$ ${\text{F}}_{\text{2}}$ beetles are produced. The ${\text{F}}_{\text{2}}$ consists of $\text{179}$ black, $\text{81}$ green, and $\text{60}$ brown. Use these data to explain the genetics of horned beetle color.