Questions 27-28 pertain to the following scenario. A plant with orange-spotted f
ID: 59728 • Letter: Q
Question
Questions 27-28 pertain to the following scenario. A plant with orange-spotted flowers was grown in a greenhouse from seed collected in the wild. The plant was self-pollinated, and gave rise to the following progeny: 88 orange with spots, 34 yellow with spots, 32 orange with no spots, and 8 yellow with no spots.
27. Given the ratios above, which of the following is a reasonable working hypothesis about the dominance relationships of the alleles responsible for the spotted and unspotted phenotypes.?
A. It is pretty much impossible to know anything.
B. Flower color and spots are probably nongenetic-caused by a virus.
C. The ratios in this cross suggest one locus with codominance.
D. The ratios in this cross suggest two loci, with orange color dominant to yellow, and spots dominant to no spots.
E. The ratios of this cross suggest one locus, with orange color and spots dominant.
28. Which of the following genotypes is consistent with that of the original, orange spotted plant in this cross?
A. YyNn
B. YN
C. YYNN
D. YyNnSs
E. none of the above
Explanation / Answer
27.
(D) The ratios in this cross suggest two loci, with orange color dominant to yellow, and spots dominant to no spots.
The ration of phenotypes of these phenotypes = 11 : 4 : 4 : 1; which is pretty much close to mendelian law of dominance for two traits (9 : 3 : 3 : 1).
28.
A. YyNn
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