Q22

[ShehryarB30]

Could you pls state the lines for this answer

[ohthatpatrick]

Lines 49 - 57 are how we justify (D).

Since the text says that fruit flies and humans have similar genes when it comes to developing eyes but very different genetic mechanisms for establishing polarity, we can support the idea that studying a fruit fly's visual system would have some applicability to humans, whereas studying a fruit fly's mechanism for establishing polarity would have little to no applicability to humans.

Lines 39-42 make it clear that even though we don't yet know how humans establish polarity, we know it's NOT something that has already occurred at the time of fertilization (as it has with fruit flies). It happens after many stages of cell division.

(A) at no point is the author suggesting that we can explain human BEHAVIOR by looking at fruit flies

(B) the author would probably be more likely to say that for elaboration of parts, human development is similar in nature to that of a fruit fly. There is no mention of QUANTITY of genetic material..

(C) This is contradicted by lines 39-42, which indicate that polarity doesn't develop in humans until several stages of cell development AFTER fertilization.

(E) At no point do we see anything close to the idea that humans CANNOT have limbs until they have a nervous system, nor that THIS is why human development takes longer than fruit fly development.