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
- Genetic Cloning
  9m
- Methods for Analyzing DNA
  9m
19. Cancer Genetics29m
- Overview of Cancer
  21m
- Cancer Mutations
  7m
20. Quantitative Genetics1h 26m
21. Population Genetics50m
- Hardy Weinberg
  19m
- Allelic Frequency Changes
  31m
22. Evolutionary Genetics29m

6. Chromosomal Variation

Chromosomal Mutations: Aberrant Euploidy

Genetics

6. Chromosomal Variation

Chromosomal Mutations: Aberrant Euploidy

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1:58 minutes

Problem 8h

Textbook Question

If 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.
Hexaploidy

Verified step by step guidance

Understand the concept of haploid number: The haploid number (n) represents the number of chromosomes in a single set of the genome. For this plant species, the haploid number is given as 4 (n = 4).

Define hexaploidy: Hexaploidy refers to an organism having six sets of chromosomes. This means the total number of chromosomes in a hexaploid organism is calculated as 6 times the haploid number.

Set up the formula for calculating the total number of chromosomes: The total number of chromosomes in a hexaploid organism can be expressed as:

Total = 6 \times n

, where n is the haploid number.

Substitute the haploid number into the formula: Replace n with 4 in the formula to determine the total number of chromosomes in a hexaploid organism.

Explain the reasoning: Since hexaploidy involves six sets of chromosomes, multiplying the haploid number (4) by 6 gives the total number of chromosomes. This calculation reflects the genetic makeup of the organism.

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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.

Polyploidy

Polyploidy is a condition in which an organism has more than two complete sets of chromosomes. Hexaploidy, specifically, means that the organism has six sets of chromosomes. This can occur through processes such as hybridization or errors in cell division, leading to increased genetic variation and potential advantages in certain environments.

Calculating Chromosome Number in Polyploids

To determine the total number of chromosomes in a hexaploid organism, you multiply the haploid number by the number of chromosome sets. For a species with a haploid number of 4, a hexaploid would have 6 sets, resulting in a total of 4 x 6 = 24 chromosomes in each somatic cell.

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