Use the following information to answer the question(s) below. In the ocean, on

Question

Use the following information to answer the question(s) below. In the ocean, on either side of the Isthmus of Panama, are 30 species of snapping shrimp, some are shallow-water species, and others are adapted to deep water. There are 15 species on the Pacific side and 15 different species on the Atlantic side. The Isthmus of Panama started rising about 10 million years ago. In Figure 22.1, the isthmus separates the Pacific Ocean on the left (side A) from the Atlantic Ocean on the right (side B). The seawater on either side of the isthmus is separated into five depth habitats (1-5), with 1 being the shallowest. In which habitat should one find snapping shrimp most closely related to shrimp that live in habitat A4? A3 A5 B4 either A3 or A5 any species from any one of the side A habitats Which of these habitats is likely to harbor the youngest species? A5 B4 A3 B2 A1 Hox genes are a group of related genes that control the body plan of an embryo. that do not effect change in location. that do not effect plant development. that cause snakes to increase limb formation. An organism has a relatively large number of Hox genes in its genome. Which of the following is of this organism? These genes are fundamental and are expressed in all cells of the organism. The organism must have multiple paired appendages along the length of its body. The organism has the genetic potential to have a relatively complex anatomy.

Explanation / Answer

13. (C)

species A4 and B4 will be closely releated because they survives in the same depth of the occan but isolated because of geograpical barrier.

14. (E)

15. (A)

Hox proteins determine the type of segment structures (e.g. legs, antennae, and wings in fruit flies or the different types of vertebrae in humans) that will form on a given segment.

16. (C)

More number of HOX gene means more segments of body means more complex anatomy.

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