Essentials of Genetics 9th Edition by Michael Palladino William Klug, Michael Cummings, Charlotte Spencer

Exercise 12

In goats, development of the beard is due to a recessive gene. The following cross involving true-breeding goats was made and carried to the F 2 generation:

Offer an explanation for the inheritance and expression of this trait, diagramming the cross. Propose one or more crosses to test your hypothesis.