Fly species W, found in a certain part of the island, produces fertile offspring with species Y. Species W does not produce fertile offspring with species X or Z
If no other species can hybridize, then which of the following statements about species W and Y are true? I) Species W and Y have genomes that are still similar enough for successful meiosis to occur in hybrid flies. II) Species W and Y have more genetic similarity with each other than either did with the other two species. III) Species W and Y may fuse into a single species if their hybrids remain fertile over the course of many generations. A) Only I is correct.
B) Only II is correct.
C) Only III is correct.
D) I, II, and III are correct.
D
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The group that is the most inclusive and has recently been added to the classification scheme is ____
a. animalia b. kingdom c. eukarya d. protista e. domain
Evolution of embryonic pathways probably occurs most commonly through ____
a. macroevolutionary mechanisms b. microevolutionary mechanisms c. protein recruitment d. extinction e. mutations during embryonic development
In a test tube, a particular DNA polymerase has an error rate of 1 mistake in every 106 bases copied. Why is the mutation rate in a cell that uses this DNA polymerase much lower?
A) The polymerase is more careful in replicating regions where genes exist. B) Repair mechanisms correct errors made by the polymerase. C) Not all mutations can be detected easily. D) The DNA polymerase has no proofreading function. E) Mutations do not occur if mutagens are not present.
The formation of the ozone shield during the Precambrian era helped to create favorable conditions for the evolution of terrestrial life forms.
Answer the following statement true (T) or false (F)