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Correct Answer: A
Correct Answer: A
Method / Topic: Biology
The correct option matches the required rule and the given information.
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Correct Answer: A
Method / Topic: Biology
In a testcross, offspring phenotypes or genotypes reveal the gametes made by the heterozygous parent. The two most frequent classes are nonrecombinant parental types, here DE and de, confirming the stated cis arrangement DE/de. For an MCAT biology problem, first identify the biological level being tested: molecule, cell, tissue, organ system, population, or experiment. Translate the stem into a cause-and-effect chain and use only the stated data plus a well-established biological principle. In physiology, follow the variable being regulated and decide whether the response is negative feedback. In genetics, separate parental from recombinant outcomes and show every probability step. In experiments, distinguish the manipulated variable, measured outcome, and appropriate comparison. Check units whenever a calculation is required. Then test every option against the mechanism; distractors often reverse direction, confuse correlation with causation, or name a true process occurring in the wrong cell, membrane, compartment, or stage. A final reasonableness check should confirm the
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PASSAGE 2 — GENETIC LINKAGE In a diploid organism, genes D and E lie on the same chromosome. A researcher testcrosses an individual with genotype DE/de to an individual with genotype de/de. Among 1,000 offspring, 420 are DE/de, 410 are de/de, 85 are De/de, and 85 are dE/de. Assume that each offspring class is equally viable and that no new mutation occurs. QUESTION 5: Which offspring classes identify the parental allele combinations?
Explanation
Correct Answer: A
Method / Topic: Biology
The correct option matches the required rule and the given information.
Short Explanation
Detailed Explanation
Correct Answer: A
Method / Topic: Biology
In a testcross, offspring phenotypes or genotypes reveal the gametes made by the heterozygous parent. The two most frequent classes are nonrecombinant parental types, here DE and de, confirming the stated cis arrangement DE/de. For an MCAT biology problem, first identify the biological level being tested: molecule, cell, tissue, organ system, population, or experiment. Translate the stem into a cause-and-effect chain and use only the stated data plus a well-established biological principle. In physiology, follow the variable being regulated and decide whether the response is negative feedback. In genetics, separate parental from recombinant outcomes and show every probability step. In experiments, distinguish the manipulated variable, measured outcome, and appropriate comparison. Check units whenever a calculation is required. Then test every option against the mechanism; distractors often reverse direction, confuse correlation with causation, or name a true process occurring in the wrong cell, membrane, compartment, or stage. A final reasonableness check should confirm the
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