Prim Question 1 of 8 Although we think of the formation of the isthmus of Panama

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Prim Question 1 of 8 Although we think of the formation of the isthmus of Panama as a geologically instantaneous event - at one moment there was a water connection between the two sides, and at the next there was not-it was likely not instantaneous from the perspective of marine species living close to the shore. As the land bridge slowty formed, so the marine channels became shallower and shallower The growing isthmus therefore isolated populations of a species that specialized in deep water earlier than populations of a species that specialized in shallow water. Here are some data on the depth tolerances for six species of another genus of shrimp, Beteus, on either side of the isthmus Species Current distribution Depth tolerance (m below surface) 0.5-3 0.5-3 A Caribbean Pacific Caribbean Pacific Caribbean Pacific 8 8-11 5-7 5-7 A similar study to the one illustrated in Fig 22.7 is carried out on these six species of Beteus. We sequence 10,000 bp of DNA from multiple loci in each species and compare the number of base par differences between each species pair (A compared to 8, C compared to D, E compared to F) Rank the species pairs in order of greatest number of base pair diterences to fewest number of base pair differences A [number of differences between A and BI > !number or differences between C and Dl [number of differences between E and Fl B.Ic and D1-1A and B) E and Fl O C. IC and DJ IE and F)>IA and B) D IA and B IE and Fl [C and D) E IE and FI> [A and 8 IC and D] Correct Point 8warded out of 1 Next Question

Explanation / Answer

1. The answer is C. [C and D] > [E and F] > [A and B]

Explaination:

The species of Beteus are located according to their specialized organs due to specific genes. Thus, the species C and D are located at the depth 8-11 m have more number of different basepair than E and F which are located at 5-7 m below the surface and have more number of different basepairs than A and B species.

According to their genes, these species are distributed at specific locations or depth below the water. Accordingly, their number of genes are also varied from one another.

2. The answer is A. Phylogeny A.

Explaination:

According to their gene level, these species may migrate and distribute at a specific depth in the pacific and carribean sea. So, the answer may be phylogeny A.

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