Textbook Question
Describe the origin of cultivated American cotton.
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Ch. 6 - Chromosome Mutations: Variation in Number and Arrangement
Klug10th EditionEssentials of GeneticsISBN: 9780135588789
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Table of contents
- Ch. 1 - Introduction to Genetics16
- Ch. 2 - Mitosis and Meiosis28
- Ch. 3 - Mendelian Genetics37
- Ch. 4 - Modification of Mendelian Ratios53
- Ch. 5 - Sex Determination and Sex Chromosomes32
- Ch. 6 - Chromosome Mutations: Variation in Number and Arrangement37
- Ch. 7 - Linkage and Chromosome Mapping in Eukaryotes36
- Ch. 8 - Genetic Analysis and Mapping in Bacteria and Bacteriophages24
- Ch. 9 - DNA Structure and Analysis38
- Ch. 10 - DNA Replication29
- Ch. 11 - Chromosome Structure and DNA Sequence Organization22
- Ch. 12 - The Genetic Code and Transcription36
- Ch. 13 - Translation and Proteins27
- Ch. 14 - Gene Mutation, DNA Repair, and Transposition34
- Ch. 15 - Regulation of Gene Expression in Bacteria22
- Ch. 16 - Regulation of Gene Expression in Eukaryotes37
- Ch. 17 - Recombinant DNA Technology27
- Ch. 18 - Genomics, Bioinformatics, and Proteomics30
- Ch. 19 - The Genetics of Cancer21
- Ch. 20 - Quantitative Genetics and Multifactorial Traits37
- Ch. 21 - Population and Evolutionary Genetics45
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Klug 10th EditionCh. 6 - Chromosome Mutations: Variation in Number and ArrangementProblem 10
Klug 10th EditionCh. 6 - Chromosome Mutations: Variation in Number and ArrangementProblem 10Chapter 6, Problem 10
Inversions are said to 'suppress crossing over.' Is this terminology technically correct? If not, restate the description accurately.
Verified step by step guidance1
Understand the concept of chromosomal inversions: an inversion is a chromosome rearrangement in which a segment of a chromosome is reversed end to end.
Recall that crossing over refers to the exchange of genetic material between homologous chromosomes during meiosis, which increases genetic diversity.
Recognize that inversions do not prevent the physical process of crossing over from occurring; rather, they affect the outcome of crossing over within the inverted segment.
Learn that crossing over within an inversion loop can produce abnormal chromatids (e.g., duplications or deletions), which are often inviable or selected against, leading to a reduction in viable recombinant offspring.
Therefore, the term 'suppress crossing over' is technically inaccurate; a more precise description is that inversions 'reduce the recovery of recombinant chromatids' or 'reduce the viability of crossover products' within the inverted region.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Chromosomal Inversions
Chromosomal inversions occur when a segment of a chromosome breaks off, flips, and reinserts in the reverse orientation. This rearrangement can affect gene order and pairing during meiosis, potentially leading to altered genetic outcomes.
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05:15
Inversions
Crossing Over During Meiosis
Crossing over is the exchange of genetic material between homologous chromosomes during prophase I of meiosis. It increases genetic diversity by producing new allele combinations but requires proper alignment of homologous regions.
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07:38Crossing Over Terminology
Effect of Inversions on Recombination
Inversions do not completely prevent crossing over but suppress viable recombinant products because crossover within the inverted region can produce unbalanced or inviable gametes. Thus, the term 'suppress crossing over' is better described as 'suppress recovery of recombinant chromatids.'
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05:15Inversions
Related Practice
Textbook Question
Predict how the synaptic configurations of homologous pairs of chromosomes might appear when one member is normal and the other member has sustained a deletion or duplication.
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Textbook Question
Human adult hemoglobin is a tetramer containing two alpha (α) and two beta (β) polypeptide chains. The α gene cluster on chromosome 16 and the β gene cluster on chromosome 11 share amino acid similarities such that 61 of the amino acids of the α-globin polypeptide (141 amino acids long) are shared in identical sequence with the β-globin polypeptide (146 amino acids long). How might one explain the existence of two polypeptides with partially shared function and structure on two different chromosomes?
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Textbook Question
The primrose, Primula kewensis, has 36 chromosomes that are similar in appearance to the chromosomes in two related species, P. floribunda (2n=18) and P. verticillata (2n=18). How could P. kewensis arise from these species? How would you describe P. kewensis in genetic terms?
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