Question

1. Mimulus lewisii and M. cardinalis are two species of Monkey flowers that do not hybridize in nature. However, in the lab fertile hybrids between the two are easy for humans to make. Which mechanism would be least likely to be keeping the species apart in nature? (Read carefully- least likely.) A. Gametic incompatibility B. Having different pollinators C. Growing in different habitats in the same range D. Flowering at different times E. Growing in different geographic ranges 2. Some of our salamander subspecies live in the same habitats and occasionally mate, but the resulting hybrid offspring do not develop fully and do not survive. Which mechanism is blocking gene flow between these sub species? A. Gametic isolation B. Hybrid zone fusion C. Hybrid breakdown D. Reduced hybrid viability E. Reduced hybrid fertility 3. Bird identification guide books once listed the Myrtle Warbler and Audubon's Warbler as distinct species. Recently, these two birds have been reclassified as eastern and western forms of a single species, the Yellow-Rumped Warbler. Which of the following pieces of evidence would justify this reclassification? A. The two forms have similar food requirements. B. The two forms live in similar habitats. C. The two forms interbreed often in nature with fertile offspring. D. The two forms have many genes in common.

          1. Mimulus lewisii and M. cardinalis are two species of Monkey flowers that do not hybridize in nature. However, in the lab fertile hybrids between the two are easy for humans to make. Which mechanism would be least likely to be keeping the species apart in nature? (Read carefully- least likely.)
A. Gametic incompatibility
B. Having different pollinators
C. Growing in different habitats in the same range
D. Flowering at different times
E. Growing in different geographic ranges

2. Some of our salamander subspecies live in the same habitats and occasionally mate, but the resulting hybrid offspring do not develop fully and do not survive. Which mechanism is blocking gene flow between these sub species?
A. Gametic isolation
B. Hybrid zone fusion
C. Hybrid breakdown
D. Reduced hybrid viability
E. Reduced hybrid fertility

3. Bird identification guide books once listed the Myrtle Warbler and Audubon's Warbler as distinct species. Recently, these two birds have been reclassified as eastern and western forms of a single species, the Yellow-Rumped Warbler. Which of the following pieces of evidence would justify this reclassification?
A. The two forms have similar food requirements.
B. The two forms live in similar habitats.
C. The two forms interbreed often in nature with fertile offspring.
D. The two forms have many genes in common.

1. Mimulus lewisii and M. cardinalis are two species of Monkey flowers that do not hybridize in nature. However, in the lab fertile hybrids between the two are easy for humans to make. Which mechanism would be least likely to be keeping the species apart in nature? (Read carefully- least likely.)
A. Gametic incompatibility
B. Having different pollinators
C. Growing in different habitats in the same range
D. Flowering at different times
E. Growing in different geographic ranges

2. Some of our salamander subspecies live in the same habitats and occasionally mate, but the resulting hybrid offspring do not develop fully and do not survive. Which mechanism is blocking gene flow between these sub species?
A. Gametic isolation
B. Hybrid zone fusion
C. Hybrid breakdown
D. Reduced hybrid viability
E. Reduced hybrid fertility

3. Bird identification guide books once listed the Myrtle Warbler and Audubon's Warbler as distinct species. Recently, these two birds have been reclassified as eastern and western forms of a single species, the Yellow-Rumped Warbler. Which of the following pieces of evidence would justify this reclassification?
A. The two forms have similar food requirements.
B. The two forms live in similar habitats.
C. The two forms interbreed often in nature with fertile offspring.
D. The two forms have many genes in common.

Added by Keith C.

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