In peas, the yellow allele is dominant over the green allele. A plant with yellow peas was crossed to a plant with green peas. The resulting plants were 50% yellow and 50% green. What is the genotype of the parents in this cross?
A) YY × yy
B) YY × Yy
C) Yy × yy
D) Yy × Yy
E) yy × yy
C
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Which of the following would best describe the results seen in a flower whose sectors have different pigmentation?
A. the result of a germ-line mutation B. the result of the plant being triploid C. the result of the plant being tetraploid D. the result of transposable elements E. the result of a deletion
Which of the following characteristics of the lactose operon is not true of the galactose operon?
A. Repressor binding prevents RNA polymerase from binding to the promoter. B. CRP activates expression when bound to cAMP. C. Expression is high when glucose levels are low and the activating metabolite is present. D. Expression is low when glucose levels are high.
Energetics: Lecture Summary
What will be an ideal response?
The amino acid sequences of human and bonobo hemoglobin are almost identical, yet they differ considerably from the sequence of the hemoglobin of wolves. This fact indicates that
A) bonobos are more closely related to humans than to wolves. B) wolves and bonobos are closely related. C) humans are more closely related to wolves than to bonobos.