Biology
Biology
12th Edition
ISBN: 9781260494570
Author: Raven, Peter
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 22, Problem 7U

Speciation by allopolyploidy

a. takes a long time.

b. is common in birds.

c. leads to reduced numbers of chromosomes.

d. occurs after hybridization between two species.

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Why does sympatric speciation via allopolyploidy occur? A. When disruptive selection and assortative mating act contemporaneously (during the same time) B. When strong prezygotic isolation prevents hybridization between two species C. When meiotic error in a single species results in unreduced gametes that can self-fertilize D. When individuals of two species mate and their offspring are sterile but eventually produce unreduced gametes that self-fertilize O E. When geographic isolation and natural selection occur contemporaneously
Which of the following is an example of postzygotic reproductive isolation?a. Sperm of species A dies in the oviduct of species B before fertilization can take place.b. Hybrid zygotes between species A and B are spontaneously aborted early indevelopment.c. The mating seasons of species A and B do not overlap.d. Males of species A are not attracted to the pheromones produced by the females ofspecies B.
Hybridization between incompletely isolated populations a. always leads to reinforcement due to the inferiority of hybrids. b. can serve as a mechanism for preserving gene flow between populations, thus preventing speciation. c. only occurs in plants. d. never affects rates of speciation.
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