Round seeds (R) are dominant to wrinkled seeds (r), and yellow seeds (Y) are dominant to green seeds (y). A plant of unknown genotype is testcrossed to a true-breeding plant with wrinkled and green seeds. The offspring produced were 53 round and yellow, 49 round and green, 44 wrinkled and yellow, and 51 wrinkled and green. What is the likely genotype of the parent in question?
A. RRYY
B. RrYY
C. RRYy
D. rryy
E. RrYy
Ans: E. RrYy
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a. the two DNA strands unwind from each other b. the two DNA strands condense for base transfers c. two DNA molecules bond d. old strands move to find new strands e. the sugar phosphate backbone is degraded
Which of the following statements is false?
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Your boss claims that customers who call to complain will drop your firm's services within the next year. He provides evidence that he believes supports his claim by showing everyone who dropped your firm's service last year also complained. How should you respond?
A. Disagree that the evidence supports the claim - it suggests a different causal relationship. B. Agree that the evidence supports the claim - it suggests a proof by transposition. C. Agree that the evidence supports the claim - it suggests a direct proof. D. None of the answers is correct.
Which of the following scenarios may produce an active trend in evolutionary change? Briefly justify your answer
A. The mechanic stability of the exoskeleton of a group of terrestrial arthropods imposes an upper limit on the body size of these organisms. B. The evolution of an endoparasitic lifestyle results in overall smaller body size as parasite species diversify to utilize small-bodied hosts that are more common than large bodied hosts. What will be an ideal response?