1) Which of the following are required for speciation to occur? (apply all if po
ID: 174885 • Letter: 1
Question
1) Which of the following are required for speciation to occur? (apply all if possible) a.physical separation of two populations b.genetic variation c.mutation d.natural selection 2)Speciation has occurred when two populations of organisms: a.become physically separated from each other. b.first acquire beneficial mutations. c.first acquire deleterious mutations. d.first acquire neutral mutations. e.are no longer capable of interbreeding. 3)Biochemical recognition systems within the stigma of a flowering plant prevent the pollen from a different species from developing a pollen tube and fertilizing its eggs. This is an example of what kind of reproductive isolation? a.pre-zygotic, behavioral isolation b.pre-zygotic, temporal separation c.pre-zygotic, lock and key d.post-zygotic, temporal separation e.post-zygotic, ecological separation Consider the two phylogenies below of five species of related flowers that hold nectar as a reward for their pollinators, five related species of moths, in their spur.The similar pattern of the phylogenies suggests the characteristics coevolved with one another. Which of the following is an accurate statement reflecting the figure above? The flowers and moths experienced the same allopatric speciation events during their history. The flowers and moths coevolved, so that spur-length and tongue-length each evolved because of changes in the other. The flowers and moths cannot co-speciate because co-speciation only occurs in host-parasite relationships. This is not an example of co-speciation. Each phylogeny represents the variation present in each population of the flower and the moth.
Increasing spur length Spur Biology: How Life Works, Second Edition 2016 w.H. Freeman and Company Increasing tongue length Tongue
Explanation / Answer
Answer
1) The mechanisms of reproductive isolation are a collection of mechanisms, behaviors, and physiological processes critical for speciation. They prevent members of different species from prodicung offspring or ensure that any offspring are sterile. These barriers amaintains the integrity of a species by reducing gene flow between related species.
Therefore, the correct options are (a) and (d).
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