AP BIOLOGY

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CLASSIFICATION

CHARACTERISTICS OF PRIMATES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The early embryos of vertebrates (in the case of mammals and birds) have gill slits, which then disappear as development progresses, meaning that they may have a pairing in the branch of evolution of fish.
A
False
B
True
C
half truth
D
half falsehood
Explanation: 

Detailed explanation-1: -embryonic development …and other nonaquatic vertebrates exhibit gill slits even though they never breathe through gills. These slits are found in the embryos of all vertebrates because they share as common ancestors the fish in which these structures first evolved.

Detailed explanation-2: -So, the correct answer is ‘Recapitulation’

Detailed explanation-3: -In the embryos of all vertebrates, the presence of gill slits supports the theory of recapitulation (repeating the early stages of embryogenesis in earlier evolved animals.)

Detailed explanation-4: -Whereas fish preserve and elaborate these clefts into true gill slits, mammals convert them into structures such as the eustachian tubes (between the ear and mouth).

There is 1 question to complete.
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