Textbook Question
An animal heterozygous for a reciprocal balanced translocation has the following chromosomes:
MN • OPQRST
MN • OPQRjkl
cdef • ghijkl
cdef • ghiST
Among the three segregation patterns, which is least likely to occur? Why?
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Ch. 10 - Eukaryotic Chromosome Abnormalities and Molecular Organization
Sanders3rd EditionGenetic Analysis: An Integrated ApproachISBN: 9780135564172
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Table of contents
- Ch. 1 - The Molecular Basis of Heredity, Variation, and Evolution64
- Ch. 2 - Transmission Genetics144
- Ch. 3 - Cell Division and Chromosome Heredity81
- Ch. 4 - Gene Interaction87
- Ch. 5 - Genetic Linkage and Mapping in Eukaryotes103
- Ch. 6 - Genetic Analysis and Mapping in Bacteria and Bacteriophages73
- Ch. 7 - DNA Structure and Replication71
- Ch. 8 - Molecular Biology of Transcription and RNA Processing79
- Ch. 9 - The Molecular Biology of Translation110
- Ch. 10 - Eukaryotic Chromosome Abnormalities and Molecular Organization100
- Ch. 11 - Gene Mutation, DNA Repair, and Homologous Recombination86
- Ch. 12 - Regulation of Gene Expression in Bacteria and Bacteriophage90
- Ch. 13 - Regulation of Gene Expression in Eukaryotes38
- Ch. 14 - Analysis of Gene Function via Forward Genetics and Reverse Genetics72
- Ch. 15 - Recombinant DNA Technology and Its Applications69
- Ch. 16 - Genomics: Genetics from a Whole-Genome Perspective49
- Ch. 17 - Organelle Inheritance and the Evolution of Organelle Genomes27
- Ch. 18 - Developmental Genetics43
- Ch. 19 - Genetic Analysis of Quantitative Traits66
- Ch. 20 - Population Genetics and Evolution at the Population, Species, and Molecular Levels105
Sanders3rd EditionGenetic Analysis: An Integrated ApproachISBN: 9780135564172Not the one you use?Change textbook
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Sanders 3rd EditionCh. 10 - Eukaryotic Chromosome Abnormalities and Molecular OrganizationProblem 14c
Sanders 3rd EditionCh. 10 - Eukaryotic Chromosome Abnormalities and Molecular OrganizationProblem 14cChapter 10, Problem 14c
Dr. Ara B. Dopsis has an idea he thinks will be a boon to agriculture. He wants to create the 'pomato,' a hybrid between a tomato (Lycopersicon esculentum) that has 12 chromosomes and a potato (Solanum tuberosum) that has 48 chromosomes. Dr. Dopsis is hoping his new pomato will have tuber growth like a potato and the fruit production of a tomato. He joins a haploid gamete from each species to form a hybrid and then induces doubling of chromosome number.
How many chromosomes will the polyploid have after chromosome doubling?
Verified step by step guidance1
Step 1: Identify the chromosome numbers of the two parent species. The tomato (Lycopersicon esculentum) has 12 chromosomes, and the potato (Solanum tuberosum) has 48 chromosomes.
Step 2: Determine the chromosome number in the haploid gametes of each species. Haploid gametes contain half the chromosome number of the parent organism. For the tomato, the haploid gamete will have 6 chromosomes (12 ÷ 2), and for the potato, the haploid gamete will have 24 chromosomes (48 ÷ 2).
Step 3: Combine the haploid gametes from the two species to form the hybrid. The hybrid will have the sum of the chromosomes from the two gametes: 6 (tomato) + 24 (potato).
Step 4: Induce chromosome doubling in the hybrid. Chromosome doubling occurs when the number of chromosomes in the hybrid is multiplied by 2. Use the formula: \( \text{Chromosome number after doubling} = 2 \times \text{Chromosome number of hybrid} \).
Step 5: Calculate the total chromosome number after doubling. Substitute the chromosome number of the hybrid into the formula from Step 4 to determine the final chromosome count.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Chromosome Number in Organisms
Different species have varying numbers of chromosomes, which are structures that carry genetic information. In this case, the tomato has 12 chromosomes, while the potato has 48. Understanding the chromosome number is crucial for predicting the genetic makeup of hybrids, as it influences traits and compatibility between species.
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Hybridization
Hybridization is the process of combining different species or varieties to create a new organism with traits from both parents. In the context of the pomato, Dr. Dopsis is attempting to merge the genetic material of a tomato and a potato. This process can lead to unique characteristics, but it also raises questions about chromosome compatibility and stability.
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Polyploidy and Chromosome Doubling
Polyploidy refers to the condition where an organism has more than two complete sets of chromosomes. In this scenario, after Dr. Dopsis joins the haploid gametes and induces chromosome doubling, the resulting polyploid will have a total of 60 chromosomes (12 from the tomato and 48 from the potato, doubled). This concept is essential for understanding how hybrids can exhibit traits from both parent species.
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Related Practice
Textbook Question
Dr. Ara B. Dopsis has an idea he thinks will be a boon to agriculture. He wants to create the 'pomato,' a hybrid between a tomato (Lycopersicon esculentum) that has 12 chromosomes and a potato (Solanum tuberosum) that has 48 chromosomes. Dr. Dopsis is hoping his new pomato will have tuber growth like a potato and the fruit production of a tomato. He joins a haploid gamete from each species to form a hybrid and then induces doubling of chromosome number. How many chromosomes will the hybrid have before chromosome doubling?
425
views
Textbook Question
Dr. Ara B. Dopsis has an idea he thinks will be a boon to agriculture. He wants to create the 'pomato,' a hybrid between a tomato (Lycopersicon esculentum) that has 12 chromosomes and a potato (Solanum tuberosum) that has 48 chromosomes. Dr. Dopsis is hoping his new pomato will have tuber growth like a potato and the fruit production of a tomato. He joins a haploid gamete from each species to form a hybrid and then induces doubling of chromosome number. Will this hybrid be infertile?
379
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Textbook Question
Dr. Ara B. Dopsis has an idea he thinks will be a boon to agriculture. He wants to create the 'pomato,' a hybrid between a tomato (Lycopersicon esculentum) that has 12 chromosomes and a potato (Solanum tuberosum) that has 48 chromosomes. Dr. Dopsis is hoping his new pomato will have tuber growth like a potato and the fruit production of a tomato. He joins a haploid gamete from each species to form a hybrid and then induces doubling of chromosome number.
Can Dr. Dopsis be sure the polyploid will have the characteristics he wants? Why or why not?
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Textbook Question
A normal chromosome and its homolog carrying a paracentric inversion are shown here. The dot (·) represents the centromere.
Normal ABC • DEFGHIJK
Inversion abc • djihgfe
Diagram the alignment of chromosomes during prophase I.
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Textbook Question
A normal chromosome and its homolog carrying a paracentric inversion are shown here. The dot (·) represents the centromere.
Normal ABC • DEFGHIJK
Inversion abc • djihgfe
Assume a crossover takes place in the region between F and G. Identify the gametes that are formed following this crossover, and indicate which, if any, gametes are viable.
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