Mendel's hypothesized that among round F2 seeds there was a 1 RR:2Rr genotype ratio and used a testcross to provide support for this idea. He took all round F2 seeds and planted them. He then crossed the mature plants to wrinkled (rr) plants. Which of the following predictions follows from his hypothesis?
A: All of the resulting F3 generation seeds will be round.
B: Two-thirds of the plants will produce all round seeds.
C: One-third of the plants will produce all round seeds.
D: All of the above
Answer: B: Two-thirds of the plants will produce all round seeds.
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Recall that eukaryotes consist of remarkably different organisms. For instance, compare a squid living in the ocean and a squirrel in your back yard. These two animals have different limbs, different mouths, and different skins
Why are these two animals so morphologically different? Select all that apply. A. These two animals use very different biochemical pathways for respiration. B. These two animals are specialized for different environments and food sources. C. These two animals use very different biochemical pathways for photosynthesis.
The amniotes differ from the amphibians in that they
a. have efficient kidneys. b. have a waterproof skin. c. have internal fertilization. d. have a shelled amniotic egg. e. include all of these.
Provide a brief summary for the fate of each of the three germ layers. What will be an ideal response?
What type of procedure is appropriate to isolate revertants from a population of threonine auxotrophic cells?
A. Threonine auxotrophic revertants could not be isolated on any type of media. B. Grow the auxotrophic cells on an agar plate without threonine; any colonies that form are presumed revertant. C. Grow the auxotrophic cells on and agar plate with threonine; any colonies that form are presumed revertant. D. Grow the auxotrophic cells in broth with threonine; if the broth becomes cloudy, revertants are presumed present.