Campbell Biology (10th Edition)
10th Edition
ISBN: 9780321775658
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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Species or F1
hybrid
Root tip chromosome
number
The following table presents chromosome data on four species of plants and their F1 hybrids:
Meiosis I Metaphase
Number of
Number of
bivalents
univalents
A
20
10
0
B
20
10
0
C
10
5
0
D
10
5
0
A x B
20
0
20
A x C
15
5
5
AxD
15
5
5
Cx D
10
0
10
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?
Homologous Chromosomes
We have discussed homologous chromosomes before. This idea is
essential to the understanding of genetics, so we will review it again.
Information
• Very simple organisms have only one set of chromosomes and they
are haploid.
► More complex organisms have two sets of chromosomes and are
diploid.
• Haploid organisms have one of each kind of chromosome and one of
every kind of gene.
Diploid organisms have two of each kind of chromosome and two of
kind of gene.
every
The two chromosomes of each kind in a diploid organism are called
homologous chromosomes because they are carrying the same
kind of traits (genes). Homo means "same."
► A human has 23 different kinds of chromosomes that are given
numbers from 1 to 23. Because we are diploid organisms we have two
of each of the different kinds. So, we have 46 chromosomes in all, made
up of 23 homologous pairs.
? QUESTION
1. How many sets of DNA molecules or chromosomes does a diploid
organism have?
2. How many sets of DNA…
Chapter 24 Solutions
Campbell Biology (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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