True-breeding, purple-flowered pea plants were crossed with true-breeding, white-flowered pea plants. The F1 progeny all had purple flowers. If the F1 offspring are self-fertilized, what progeny phenotypes would be expected?
A. 1 purple : 2 pink : 1 white
B. 3 white : 1 purple
C. 3 purple : 1 white
D. all purple
E. all white
C
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Which layer of the digestive tract gives rise to sphincters?
a. mucosa b. circular muscle c. longitudinal muscle d. submucosa e. serosa
Which of the following contributes to an erythrocyte's efficiency in distributing oxygen?
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