Multiple Choice
If a new species of plant is to be produced by means of allopolyploidy from two parental species that are 2n = 4 and 2n = 8, how many chromosomes would you expect in the somatic cells of the new species?
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23. Speciation
Introduction to Speciation
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In a hybrid zone, which of the following would tend to lead to reinforcement?
A
Reduced hybrid viability
B
Hybrid breakdown
C
Reduced hybrid fertility
D
Sexual selection
E
All of the listed responses are correct.
Verified step by step guidance1
Understand the concept of a hybrid zone: A hybrid zone is a geographic area where two closely related species meet and interbreed, producing hybrid offspring.
Explore the concept of reinforcement: Reinforcement is the process by which natural selection increases reproductive isolation between two populations, often by favoring traits that reduce hybridization.
Analyze reduced hybrid viability: Reduced hybrid viability means that hybrid offspring have lower survival rates, which can lead to reinforcement as it discourages interbreeding.
Examine hybrid breakdown: Hybrid breakdown refers to the situation where hybrid offspring are fertile but their descendants have reduced fitness, leading to reinforcement as it reduces the success of hybrid lineages.
Consider reduced hybrid fertility and sexual selection: Reduced hybrid fertility means hybrids are less likely to reproduce successfully, while sexual selection can favor traits that prevent hybridization, both contributing to reinforcement.
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