Official Solution: Although genetic recombination ensures that only half the genetic material of a parent is represented in the offspring, some genetic lines may eventually die out entirely, even though there are numerous progeny.A. Although
B. Conclusively
C. When
D. Because
E. If
The underlined word must establish the proper logical relationship between the first part of the sentence and the later clauses. The facts among which a relationship must be stated are:
1. That genetic recombination permits only half of a parent’s genetic material to be represented in the offspring;
2. That some genetic lines may eventually not be passed on, despite a large number of progeny. If only half of a parent’s genetic material is present in any single offspring, it follows that some genetic lines may not be reproduced at all and could eventually die out entirely. The relationship that should be stated in the sentence is, therefore, a causal relationship.
(A)
Although makes the dying out of
some genetic lines seem like an exception to a rule, and does not establish the appropriate cause-and-effect relationship between the parts of the sentence.
(B)
Conclusively does not make sense in this context.
(C) The word
when makes
genetic recombination seem like a process that happens
sometimes, and so does not establish the appropriate logical relationship among parts of the sentence.
(D) CORRECT. This option correctly identifies the fact that
genetic recombination is given as the
reason that
some genetic lines may eventually die out entirely. (E)
If makes
genetic recombination seem like a conditional event and does not establish the appropriate logical relationship among parts of the sentence.
Answer: D