Table of contents
- 1. Introduction to Genetics51m
- 2. Mendel's Laws of Inheritance3h 37m
- 3. Extensions to Mendelian Inheritance2h 41m
- 4. Genetic Mapping and Linkage2h 28m
- 5. Genetics of Bacteria and Viruses1h 21m
- 6. Chromosomal Variation1h 48m
- 7. DNA and Chromosome Structure56m
- 8. DNA Replication1h 10m
- 9. Mitosis and Meiosis1h 34m
- 10. Transcription1h 0m
- 11. Translation58m
- 12. Gene Regulation in Prokaryotes1h 19m
- 13. Gene Regulation in Eukaryotes44m
- 14. Genetic Control of Development44m
- 15. Genomes and Genomics1h 50m
- 16. Transposable Elements47m
- 17. Mutation, Repair, and Recombination1h 6m
- 18. Molecular Genetic Tools19m
- 19. Cancer Genetics29m
- 20. Quantitative Genetics1h 26m
- 21. Population Genetics50m
- 22. Evolutionary Genetics29m
6. Chromosomal Variation
Chromosomal Mutations: Aberrant Euploidy
2:22 minutes
Problem 8d
Textbook Question
Textbook QuestionIf the haploid number for a plant species is 4, how many chromosomes are found in a member of the species that has one of the following characteristics? Explain your reasoning in each case.
octaploidy
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Haploid and Diploid Numbers
The haploid number (n) refers to the number of chromosomes in a gamete, which is half the total number of chromosomes in a diploid organism. In this case, if the haploid number for the plant species is 4, the diploid number (2n) would be 8, representing the total chromosomes in somatic cells.
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Diploid Genetics
Polyploidy
Polyploidy is a condition in which an organism has more than two complete sets of chromosomes. Octaploidy, specifically, means that the organism has eight sets of chromosomes. This can occur through processes such as whole genome duplication, which is common in plants and can lead to increased size and vigor.
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Autopolyploidy
Calculating Chromosome Number in Polyploids
To determine the total number of chromosomes in a polyploid organism, you multiply the haploid number by the number of chromosome sets. For octaploidy, with a haploid number of 4, the total chromosome count would be 4 (haploid) x 8 (sets) = 32 chromosomes in the octaploid plant.
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