Study Guide Key Ch_24_Macroevolution

Study Guide Key Ch_24_Macroevolution - Chapter 24 The...

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Chapter 24: The Origin of Species Interactive Question 24.1 Name the type of reproductive barrier and whether it is pre- or postzygotic for the following examples. Type of Barrier Pre- or Post- Example a. reduced hybrid fertility b. Post- Two species of frogs are mated in the lab and produce viable, but sterile, offspring. c. gametic isolation d. Pre- Two species of sea urchins release gametes at the same time, but no cross fertilization occurs. e. mechanical isolation f. Pre- Two orchid species with different length nectar tubes are pollinated by different moths. g. temporal isolation h. Pre- Two species of mayflies emerge during different weeks in spring i. hybrid breakdown j. Post- Two species of salamanders mate and produce offspring, but the hybrid’s offspring are sterile. k. behavioral isolation l. Pre- Two similar species of birds have different mating rituals m. reduced hybrid viability n. Post- Embryos of two species of mice bred in the lab usually abort o. habitat isolation p. Pre- Peepers breed in woodland ponds; leopard frogs reed in swamps Interactive Question 24.2 Fill in the following table to review the five approaches that biologists have proposed for conceptualizing a species. Concept Emphasis Biological a. reproductive isolation b. morphological Anatomical differences, most commonly used c. ecological Unique roles in specific environments d. paleontological Morphologically discrete fossil species phylogenetic e. evolutionary lineage leading to unique genetic history
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Interactive Question 24.3 a. A new plant species B forms by autopolyploidy from species A, which had a chromosome number of 2n = 10. How many chromosomes would species B have? a. 20 chromosomes b. If species A were to hybridize by allopolyploidy with species C (2n = 14) and produce a new, fertile species, D, how many chromosomes would species D have? a. 24 chromosomes Interactive Question 24.4 a. Differentiate between allopatric and sympatric speciation a. In allopatric speciation, a new species forms while geographically isolated from the parent population. In sympatric speciation, some reproductive barrier isolates the gene pool of a subgroup of a population within the same geographic range as
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This note was uploaded on 09/13/2011 for the course BIOLOGY 150 taught by Professor Robertsmith during the Spring '11 term at Broome Community College.

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Study Guide Key Ch_24_Macroevolution - Chapter 24 The...

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