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- A prezygotic barrier prevents (a) the union of egg and sperm (b) reproductive success by an interspecific hybrid (c) the development of the zygote into an embryo (d) allopolyploidy from occurring (e) changes in allometric growth10. The herbivorous Japanese ladybird beetle Henosepilachna yasutomii (which feeds on blue cohosh), and the sympatric beetle Henosepilachna nipponica (which feeds on thistles), do not ordinarily interbreed because they are reproductively isolated by which pre-zygotic barrier? A. mechanical isolation B. allopatric isolation by means of vicariance C. habitat isolation D. allopatric isolation by means of dispersal E. gamete isolation2. Male dragonflies of one species are unable to grasp the abdomen of female dragonflies of a different species securely enough to mate, due to poor alignment of the four wings on each insect. This type of interference during mating attempts between different dragonfly species is: A. an example of a pre-zygotic barrier due to behavioral isolation B. an example of a pre-zygotic barrier due to gamete isolation C. an example of a pre-zygotic barrier due to mechanical isolation D. an example of alpre-zygotic barrier due to habitat isolation E. an example of a pre-zygotic barrier due to temporal isolation
- Which of the following are examples of post-zygotic barriers? I. Gametic isolation II. Mechanical Isolation III. Reduced hybrid viability I only II only III only I and II I and III II and III I, II and IIIPrezygotic is isolating mechanisms: a. reduce the fitness of hybrid offspring. b. generally prevent individuals of different species from producing zygotes. c. are found only in animals. d. are found only in plants. e. are observed only in organisms that reproduce aseually.2) In some Drosophila species, conditions in the female reproductive tract do not allow the sperm of other species to survive long enough for fertilization to occur. What mechanism of reproductive isolation is in operation in this example? a.Temporal isolation. b.Mechanical isolation. c.Low hybrid viability. d.Gametic isolation.
- 5. Hybridizations between Japanese rice (Oryza sativa japonica) and Indian rice (Oryza sativa ind result in F, hybrids that are both healthy and fertile, but when these Fi hybrids are crossed, the resu F2 generation is weak and infertile. This type of reproductive isolation: A. is a post-zygotic barrier known as behavioral F, inferiority B. is a post-zygotic barrier known as F2 hybrid breakdown C. is a post-zygotic barrier known as ecological F, inferiority D. is a post-zygotic barrier known as F1 hybrid sterility E. is a post-zygotic barrier known as Fi hybrid inviabilityMembers of two separate species mate and produce hybrid offspring that fail to thrive in the environment. The hybrid genotypes do not suit the hybrid organism for survival using any given niche. Eventually, the hybrid genotypes disappear from the environment. This would be due to: A. hybrid inviability B. hybrid sterility C. gametic incompatibility D. pre-zygotic isolation E. infra-gametic disruptionInterspecific hybrids, if they survive, are (a) always sterile (b) always fertile (c) usually sterile (d) usually fertile (e) never sterile
- 5. The wood frog (Rana sylvaticus) is unable to breed successfully with the leopard frog (Rana pipiens) because their F1 hybrid offspring die early in embryogenesis. This type of reproductive isolation is: A. best categorized as a post-zygotic barrier known as behavioral F1 inferiority B. best categorized as a post-zygotic barrier known as F2 hybrid breakdown C. best categorized as a post-zygotic barrier known as F, hybrid sterility D. best categorized as a post-zygotic barrier known as F1 hybrid inviability E. best categorized as a post-zygotic barrier known as ecological F; inferiority4. The roof rat (Rattus rattus) and the Norway rat (Rattus norvegicus) are unable to interbreed because their F1 progeny die during embryogenesis. This type of reproductive isolation is best described as: A. a post-zygotic barrier known as behavioral F, inferiority B. a post-zygotic barrier known as F, hybrid breakdown C. a post-zygotic barrier known as ecological F, inferiority D. a post-zygotic barrier known as F, hybrid sterility E. a post-zygotic barrier known as F, hybrid inviabilityIdentify each of the following reproductive barriers as prezygotic or postzygotic. a. One lilac species lives on acidic soil, another on basic soil. b. Mallard and pintail ducks mate at different times of the year. c. Two species of leopard frogs have different mating calls. d. Hybrid offspring of two species of jimsonweed always die before reproducing. e. Pollen of one kind of pine tree cannot fertilize another kind.