In certain genetic inheritance patterns, inherited traits can skip a generation in a family tree. _____ it is entirely possible for an individual to share a trait, such as square nails, with a grandparent but not with either biological parent.
Which choice completes the text with the most logical transition?
Explanation
Context: The passage states that in certain genetic inheritance patterns a trait can skip a generation, then says a person may share a trait such as square nails with a grandparent while neither biological parent has it.
Answer: A) Thus,
Why? The grandparent case is what skipping a generation looks like in a real family tree, so the blank must present it as the conclusion that follows from the pattern.
Traps:
- B) "Still," concedes that something holds despite the first sentence, but this outcome agrees with the pattern instead of resisting it.
- C) "On the contrary," denies the preceding statement, and the square-nails case confirms it.
- D) "In addition," makes the example an unrelated extra fact, missing that it follows directly from the inheritance pattern just described.