11 1 point Interspecies breeding between two species of lilies (flowering plant) produces a sterile hybrid which is reproductively isolated from the parental species but may propagate asexually. In subsequent generations a fertile polyploid orchid is produced forming a new species. The most likely mechanism to account for the formation of the fertile polyploid was a... mitotic error cross-fertilization meiotic error inbreeding physical barrier
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This can occur due to errors in cell division, such as during meiosis. Show more…
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Botanists estimate that half or more of angiosperm species may be polyploids that arose initially through hybridization. Polyploidy-having more than a diploid set of the parental chromosomes-can result from nondisjunction of homologous chromosomes during meiosis, or when cytokinesis fails to occur in a dividing cell. Hybridization is the successful mating of individuals from two different species. Such an interspecific hybrid is likely to be sterile because it has uneven numbers of parental chromosomes, or because the chromosomes are too different to pair during meiosis. A sterile hybrid may reproduce asexually, however, and if by chance its offspring should become polyploid, that plant will be fertile because the original set of chromosomes will have homologs that can pair normally during meiosis. Explain why both the hybrid parent and fertile polyploid offspring may be considered a new species.
7. The hybrids between tetraploid and diploid plants of the same ancestral species A) are usually sterile. B) are triploid. C) have chromosomes that usually synapse incorrectly during meiosis. D) Both b and c E) All of the above 8. Which of the following is the correct way to write the species and genus? A) Homo sapien B) Homo sapien C) homo sapien D) Homo sapien 9. Which of the following is not a prezygotic reproductive isolating barrier? A) Behavioral isolation B) Mechanical isolation C) Hybrid infertility D) Temporal isolation E) None of the above 10. The biological species concept does not apply to which groups of organisms? A) Birds B) Organisms in which males and females form monogamous pair bonds C) Organisms that reproduce asexually D) Organisms that engage in sexual reproduction E) Insects 11. Geographical speciation is also known as A) reinforcement. B) sympatric speciation. C) Darwinian speciation. D) the biological species concept. E) allopatric speciation. 12. Which of the following choices is the conventional representation for the name of a sea star common to the rocky intertidal zone? A) Pisaster Ochraceous B) Pisaster Ochraceous C) Pisaster ochraceous D) pisaster ochraceous E) pisaster ochraceous
Adi S.
If there are two species of butterfly that are able to mate but produce sterile offspring, are the offspring considered a new species? Group of answer choices: Yes - according to both the morphospecies concept and the biological species concept because the offspring are physically similar. Yes – according to the biological species concept because the offspring can mate. No – according to the biological species concept because the offspring are sterile. No – according to the morphospecies concept because the offspring are sterile. Which of the following does NOT describe a potential pathway for speciation? Group of answer choices: Differing courtship rituals. Increased gene flow. Breeding at different times of the year. Polyploidy.
Keemin L.
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