Chapter 13, Problem 7GP

Several alleles affect traits of roses, such as plant form and bud shape. Alleles of one gene govern whether a plant will be a climber (dominant) or shrubby (recessive). All F₁ offspring from a cross between a true-breeding climber and a shrubby plant are climbers. If an F₁ plant is crossed with a shrubby plant, about 50 percent of the offspring will be shrubby; 50 percent will be climbers. Using symbols A and a for the dominant and recessive alleles, make a Punnett- square diagram of the expected genotypes and phenotypes the cross between the F₁ offspring and the shrubby plant.