In corn (zea mays, purple kernels (r are dominant to yellow kernels (r. cobs from the offspring of a cross between a purple plant and yellow plant were used in a lab. a student counts 329 purple and 299 yellow kernels on one cob.

Explanation:

Purple= R, and R is dominant on r

yellow =r,

As given,  cross between a purple heterozygous  corn plant (Rr) and a recessive yellow corn plant (rr)

yield offspring that display a 1:1 ratio between purple  kernels and yellow kernels. Of the total kernels,

it would be expected that 279 would be purple and 279 would be yellow but here results are little differ. The chi-square value is

calculated as: the range of acceptable result should be 1.43-1.44.  

Phenotype  observed,  expected,  obs-exp,   (obs-exp)2      (obs-exp)2/exp

Purple          329            314               15                  225                  0.72

Yellow          299           314               -15                  225                  0.72

                                                                                                         X² = 1.44

just finished the test, the answer is d, greg is the least cost-effective because he charges the most for the project