Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
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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I need help with b, c, d
the choices for c) are haploid, diploid or tetraploid
the choices for d) are same chromosome, a pair of homologus chromosomes, or two different chromosomes
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…
. 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
Chapter 24 Solutions
Campbell Biology
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 - MAKE CONNECTIONS Compare Figure 13.12 with Figure...Ch. 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 - WRITE ABOUT A THEME: INFORMATION In sexually...Ch. 24 - Prob. 10TYU
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