In corn plants purple kernel color is dominant to

10.
In corn plants, purple kernel color is dominant to yellow kernel color, and smooth kernels are dominant to wrinkled
kernels. Researchers carried out a genetics experiment to investigate whether the genes controlling kernel color and
kernel texture segregate independently. In their experiment, the researchers crossed two corn plants that were each
heterozygous for both kernel color and kernel texture. The results of the experiment are presented in Table 1.
Table 1. Results of a genetic cross between two heterozygous corn plants
Offspring Phenotype Observed Expected
Purple, smooth kernels 918 900
Purple, wrinkled kernels 281 300
Yellow, smooth kernels 314 300
Yellow, wrinkled kernels 87 100
Using a significance level of , which of the following statements best completes a chi-square goodness-of-
fit test for a model of independent assortment?
Scoring Guide
Unit 5 Progress Check: MCQ
AP Biology Page 5 of 17

11. Several members of a family are found to involuntarily sneeze when exposed to bright lights, such as sunlight.
Following analysis of the condition in the family, a doctor predicts that the symptoms have an underlying genetic
basis. A pedigree of the family is shown in Figure 1.-please edit “male” to XY individual and “female” to XX
individual
Figure 1. Pedigree showing family members with and without symptoms
For this condition, which of the following modes of inheritance is most consistent with the observations?