Table of contents

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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

20. Quantitative Genetics

Mathematical Measurements

Genetics

20. Quantitative Genetics

Mathematical Measurements

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Multiple Choice

The table shows a distribution of bristle numbers in a Drosophila population. What is the variance?

1.0

1.2

5.5

3.0

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Verified step by step guidance

First, understand that variance is a measure of how much the values in a data set differ from the mean. It is calculated as the average of the squared differences from the mean.

To calculate the variance, you need to find the sum of the squared differences from the mean for each bristle number, which is already provided in the 'Sum (X-M)^2' column.

Add up all the values in the 'Sum (X-M)^2' column to get the total sum of squared differences. In this case, add 27.38, 21.87, 26.01, 14.21, 4.95, 30.42, and 21.16.

Next, calculate the total number of individuals in the population by summing up the 'Number of Individuals' column: 2 + 3 + 9 + 29 + 55 + 18 + 4.

Finally, divide the total sum of squared differences by the total number of individuals to find the variance. This will give you the average squared difference from the mean, which is the variance.