EBK CAMPBELL BIOLOGY IN FOCUS
2nd Edition
ISBN: 8220101459299
Author: Reece
Publisher: PEARSON
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Chapter 22, Problem 7TYU
SCIENTIFIC INQUIRY
DRAW IT In this chapter, you read that bread wheat (Triticum aestivum) is an allohexaploid, containing two sets of chromosomes from each of three different parent species. Genetic analysis suggests that the three species pictured following this question each contributed chromosome sets to T. aestivum. (The capital letters here represent sets of chromosomes rather than individual genes.) Evidence also indicates that the first polyploidy event was a spontaneous hybridization of the early cultivated wheat species T. monococcum and a wild Triticum grass species. Based on this information, draw a diagram of one possible chain of events that could have produced the allohexaploid T. aestivum.
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Which of the following statements is true of a species that has a chromosome number of 2n = 46?
O A. The species is haploid with 23 chromosomes per cell.
B. The species is diploid with 46 homologous pairs of chromosomes.
C. The species is haploid with 46 chromosomes per cell.
D. A gamete from this species has 23 chromosomes.
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The figure below shows three cells from the same diploid organism. Use this figure to answer the following question: What is the ploidy
number of this organism in N-notation?
B
500
K
*******
O a. Hemiploid
O b. 2n = 14
O c. n = 14
O d. 2n = 7
Oe. either c or d is correct
C
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Experiment:
Saccharomyces cerevisiae can exist stably in either a haploid or a diploid state. A haploid S. cerevisiae
cell has 16 chromosomes. When certain haploids come into contact, they fuse their cell walls and
membranes, followed by the fusion of their nuclear membranes. The single nucleus now has 32
chromosomes, 16 from each parent strain, and is thus a diploid.
Haploid yeast strains divide mitotically to give rise to haploid progeny, and diploid strains divide
mitotically to give rise to diploid progeny. Certain haploids can fuse to form diploids. Haploid S.
cerevisiae exists in two "mating types," called a and a. Mating occurs only between a and a cells; no
mating occurs between cells of identical mating type.
We have a collection of eight a haploid mutant strains and eight a haploid mutant strains of yeast
unable to synthesize tryptophan (trp). These will be combined (mated) in all possible combinations
to yield diploid strains. If the diploids can grow on minimal medium,…
Chapter 22 Solutions
EBK CAMPBELL BIOLOGY IN FOCUS
Ch. 22.1 - Prob. 1CCCh. 22.1 - WHAT IF? Suppose you are studying two bird species...Ch. 22.2 - Contrast allopatric and sympatric speciation....Ch. 22.2 - WHAT IF? Is allopatric speciation more likely to...Ch. 22.2 - MAKE CONNECTIONS Review the process of meiosis in...Ch. 22.3 - What are hybrid zones, and why can they be viewed...Ch. 22.3 - WHAT IF? Consider two species that diverged while...Ch. 22.4 - Speciation can occur rapidly between diverging...Ch. 22.4 - Summarize evidence that the yup flower-color locus...Ch. 22.4 - MAKE CONNECTIONS Compare Figure 10.11 with Figure...
Ch. 22 - The largest unit within which gene flow can...Ch. 22 - Males of different species of the fruit fly...Ch. 22 - According to the punctuated equilibria model, A....Ch. 22 - Bird guides once listed the myrtle warbler and...Ch. 22 - Which of the following factors would not...Ch. 22 - Plant species A has a diploid number of 12. Plant...Ch. 22 - SCIENTIFIC INQUIRY DRAW IT In this chapter, you...Ch. 22 - SCIENCE, TECHNOLOGY, AND SOCIETY In the United...Ch. 22 - FOCUS ON EVOLUTION Explain the biological basis...Ch. 22 - FOCUS ON INFORMATION In sexually reproducing...Ch. 22 - Prob. 11TYU
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