Campbell Biology, Books a la Carte Plus Mastering Biology with eText -- Access Card Package (10th Edition)
10th Edition
ISBN: 9780133922851
Author: Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson
Publisher: PEARSON
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Chapter 24, Problem 8TYU
SCIENTIFIC INQUIRY • DRAW IT In this chapter, you read thut 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, and the diploid chromosome number for each species is shown in parentheses.)
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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Meiosis I Metaphase
Number of
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univalents
A
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10
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B
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10
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C
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D
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A x B
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A x C
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Deduce the chromosomal origin of Species A. Show clearly the basis of your answer by
analyzing and diagramming the crosses given above. Distinguish between chromosomes and
give chromosome number for individuals in the crosses mentioned above. From these crosses,
diagram the cross that gave rise to Species A.
b. How many bivalents and univalents would you expect to observe at meiotic metaphase I in a
hybrid between species C and species B?
c. How many bivalents and univalents would you expect to observe at meiotic metaphase I in a
hybrid between species D and species B?
. Genomes A, B, and C all have basic chromosomenumbers (x) of nine. These genomes were derivedoriginally from plant species that had diverged from each other sufficiently far back in the evolutionarypast that the chromosomes from one genome can nolonger pair with the chromosomes from any other genome. For plants with the following kinds of euploidchromosome complements, (i) state the number ofchromosomes in the organism; (ii) provide terms thatdescribe the individual’s genetic makeup as accurately as possible; (iii) state whether or not it is likelythat this plant will be fertile, and if so, give the number of chromosomes (n) in the gametes.a. AABBCb. BBBBc. CCCd. BBCCe. ABCf. AABBCC
Telomere
(ends)
Centromere
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2A
2B
Chimpanzee Chromosomes
Human
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What does the diagram tell us about the evolutionary history of
humans and chimpanzees? Select all true statements.
O Humans and chimpanzees have a different number of chromosomes and
are therefore unrelated.
Human chromosome number 2 is a fusion of chimpanzee chromosome 2A
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Human and chimpanzees share a common ancestor.
In the evolution of humans, a chromosome was lost.
Chapter 24 Solutions
Campbell Biology, Books a la Carte Plus Mastering Biology with eText -- Access Card Package (10th Edition)
Ch. 24.1 - Prob. 1CCCh. 24.1 - WHAT IF? Suppose two bird species live in a...Ch. 24.2 - Summarize key differences between allopatric and...Ch. 24.2 - Prob. 2CCCh. 24.2 - WHAT IF? Is allopatric speciation more likely to...Ch. 24.2 - MAKE CONNECTIONS Review the process of meiosis in...Ch. 24.3 - 1. What are hybrid zones, and why can they be...Ch. 24.3 - WHAT IF? Consider two species that diverged while...Ch. 24.4 - Speciation can occur rapidly between diverging...Ch. 24.4 - Prob. 2CC
Ch. 24.4 - Prob. 3CCCh. 24 - Explain the role of gene flow in the biological...Ch. 24 - Can factors that cause sympatric speciation also...Ch. 24 - What factors can support the long-term stability...Ch. 24 - Is speciation something that happened only in the...Ch. 24 - The largest unit within which gene flow can...Ch. 24 - Prob. 2TYUCh. 24 - Prob. 3TYUCh. 24 - Prob. 4TYUCh. 24 - Which of the following factors would not...Ch. 24 - Plant species A has a diploid chromosome number of...Ch. 24 - Prob. 7TYUCh. 24 - SCIENTIFIC INQUIRY DRAW IT In this chapter, you...Ch. 24 - Prob. 9TYUCh. 24 - Prob. 10TYUCh. 24 - WRITE ABOUT A THEME: INFORMATION In sexually...Ch. 24 - Prob. 12TYU
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- can you help please?arrow_forward. Imagine that you have done a cross between twostrains of yeast, one of which has the genotype A B Cand the other a b c, where the letters refer to threerather closely linked genes in the order given. Youexamine many tetrads resulting from this cross, andyou find two that do not contain the expected two Band two b spores. In tetrad I, the spores are A B C, AB C, a B c, and a b c. In tetrad II, the spores are A BC, A b c, a b C, and a b c. How have these unusualtetrads arisen?arrow_forwardPlz asaparrow_forward
- production) IN 3 DIFFERENT SPECIES, EACH WITH /TS OWN UMBER OE CHROMOSOMES * GONAD GERNM CELL DIVISION TE The drawings on the left represent stages in the two divisions of meiosis for a diploid cell in which N=2. In the other boxes in each row, draw the same stages in cells with the indicated chromosome SPECIES Y N=1 Part IV. Images SPECIES Z N=3 numbers. SPECIES X N=2 NAME the PHASE The events pictured in this row and the one below happen in both products of the first division cells * and the total number must be 2N (i.e 2 sets, one from each parent) because this can only Kappen in sexual species. Label: Homolgous chromosome Replicated chromosome Chromatid 10 Genome (think carefully for this) 2 Phases of Hhe 1stdivision of meiosis- 2 phases of the 2nd division of meiosis-arrow_forwardcell type: 9) Label the figure below. Chromosome number: cytokinesis by: division type: А- В- С- D- E- the halves the number of chromosomes, and at the same time, stage. The result is 10) daughter cells event that causes genetic diversity takes place in called (n? 2n?). An organism with two of each kind of chromosome is said to be: (3) tetraploid (1) haploid (2) diploid (4) polyploid. In multicellular organisms, mitosis results in: (1) reproduction (2) growth and repair (3) sperm and egg production (4) fertilization. If an organism produced an egg that had 20 chromosomes, the body cells of that organism should have: (1) 10 chromosomes (2) 20 chromosomes (3) 30 chromosomes (4) 40 chromosomes. 11) is what helps us grow and is why we are all unique! Human female karyotype contains .... (number) pairs autosomal and sex chromosomes. separate to go opposite poles in Anaphase in mitosis, while in Meiosis in AnaphaseI. (how many?) 12) If a diploid parent cell with 8 chromosomes (2n=8)…arrow_forwardBacteria populations displayed genetic variation such as antibiotic resistance due to mutation which is the likely source of mutationarrow_forward
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