PrepTest 121, Section 3, Question 24
The first thing any embryo must do before(467 more words not shown)
By " conservation of mechanism(13 more words not shown)
- Ahow the same(12 more words not shown)
- Bthe fact that(7 more words not shown)
- Chow few genes(10 more words not shown)
- Da highly complex(10 more words not shown)
- Ethe fact that(12 more words not shown)
Reading the passage
Read the phrase with the example that follows it. The writer says there is a conservation of mechanism, then explains that genes making eyes in flies are similar to genes making eyes in mice or humans.
What we’re looking for
Here, conservation means that a similar mechanism is retained across species. It isn't a claim about saving genetic material or using only one or two genes.
Working the answers
- A
This compares different parts within a single organism. The example compares corresponding structures—eyes—across different organisms.
- B
We aren't discussing genetic material being wasted or saved. That is a different meaning of conservation.
- C
No count of the genes needed to develop parts is given. The claim concerns similarity between species, not how few genes an individual organism needs.
- D
Again, no quantities of genetic material are compared between simpler and more complex organisms.
- ECorrect
Corresponding structures in different species arise through similar genetic means. The fly, mouse, and human eye example directly explains this sense of conservation.
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