In a hypothetical situation, a certain species of aphid feeds only on sugar mapl

Question

In a hypothetical situation, a certain species of aphid feeds only on sugar maple trees. In forests of the eastern United States, sugar maples are only one of a number of different tree species. If some of the aphids develop a strong preference for feeding on Black Walnut trees and mate only with other aphids that prefer black walnut trees, then over time, which of the following processes should occur. (Remember, the host species can be considered the aphids' "habitat."): 1.reproductive isolation 2.allopatric speciation 3.habitat isolation 4.prezygotic barriers

a) 1 through 4
b) 1 only
c) 1, 3, and 4
d) 2 and 3
e) 1, 2, and 3

During a dissection, you push a pin from the outside of an organism into its gastrointestinal tract. In doing so, you pass through multiple distinct mesoderm layers on the way to the GI tract. Which of these statements is likely true?

a) The organism is a coelomate.

b) The organism is a protostome.

c) The organism is a cnidarian.

d) The organism diploblastic.

Which of the following statements about speciation is correct?

a) The goal of natural selection is speciation.
b) When reunited, two allopatric populations will interbreed freely if speciation has occurred.
c) Natural selection chooses the reproductive barriers for populations.
d) it always takes millions of years for speciation to occur.
e) Speciation is a basis for understanding macroevolution.

Select the correct statement(s) about animal body plans.

a) In both protostomes and deuterostomes, the initial blastopore develops into the mouth.
b) Development in animals is determined by the unique family of Hox genes (or other similar homeobox genes).
c) All triploblastic animals possess a coelom.
d) Both A and B
e) All three statements are correct.

Explanation / Answer

Solution 2. The organism is coelomate and triploblastic.

Solution 3. Speciation is a basis for understanding macroevolution.

Solution 4. Answer is part b, that is development in animals isbdeteris de by unique family of hox genes.

In protostomes, blastopore develops in mouth but in deutrostome bladtopore develops in excretory opening.

Triploblastic animals were coelomate but with time they lost coelomate.

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