Stern's Introductory Plant Biology
14th Edition
ISBN: 9781259682742
Author: James Bidlack, Shelley Jansky, Kingsley R Stern
Publisher: McGraw-Hill Education
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Chapter 15, Problem 5RQ
What are some advantages and disadvantages of allopolyploidy compared to autopolyploidy?
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- What is heterosis? Discuss whether it is caused by a single geneor several genes. Discuss the two major hypotheses proposedto explain heterosis. Which do you think is more likely to becorrect?arrow_forwardContrast the origins of autopolyploids and allopolyploids.arrow_forwardYou are interested in studying the evolution of Rnase-based gametophytic self-incompatibility. You go into a population and identify 4 S-alleles present. These alleles are designated S1, S2, S3, and S4, and they occur in the sporophyte only as heterozygotes at equal frequency, in each of the 6 possible combinations: S1 S2 S₁ S3 S1 S4 S₂ S3 S₂ S4 S3 S4 Assuming random dispersal of pollen, what fraction of S₁ pollen grains that land on stigmas will be able to fertilize ovules in this population? Why?arrow_forward
- Which of the following is true of polyploidy?arrow_forwardWhat hemispheric dominance?Explainarrow_forwardSpecies I has 2 n = 8 chromosomes and species II has 2 n = 14 chromosomes. What would the expected chromosome numbers be in individuals with the following chromosome mutations? Give all possible answers. Q. Allotriploidy including species I and IIarrow_forward
- what are allopolyploids.?arrow_forwardBesides the ones mentioned in this textbook, look for other examplesof variations in euploidy. Perhaps you might look in moreadvanced textbooks concerning population genetics, ecology, etc.Discuss the phenotypic consequences of these changes.arrow_forwardConsider this four-factor cross: Tt Rr yy Aa × Tt RR Yy aa, whereT = tall, t = dwarf, R = round, r = wrinkled, Y = yellow, y = green,A = axial, a = terminal. What is the probability that the first three plantswill have round seeds? What is the easiest way to solve this problem?arrow_forward
- A fruit fly was found to be heterozygous for a paracentric inversion. However, obtaining flies that were homozygous for the inversion was impossible even after many attempts. What is the most likely explanation for this inability to produce a homozygous inversion?arrow_forwardA large plant arose in a natural population. Qualitatively,it looked just the same as the others, except much larger. Is it more likely to be an allopolyploid or anautopolyploid? How would you test that it was a polyploid and not just growing in rich soil?arrow_forwardWhy does aneuploidy usually have a detrimental effect on phenotype while polyploidy doesn't have as detrimental of an effect?arrow_forward
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