In a flowering plant species, snapdragons, variation in flower color is determined by a single gene. RRgenotype individuals are red, Rrgenotype individuals are pink, and rr genotype individuals are white. In a cross between two heterozygous (Rr) individuals, the expected ratio of red:pink:white-flowered offsprings is 1:2:1. Biologists did two cross experiments, and ask whether the results differ significantly from the expected.
In a flowering plant species, snapdragons, variation in flower color is determined by a single gene. RRgenotype individuals are red, Rrgenotype individuals are pink, and rr genotype individuals are white. In a cross between two heterozygous (Rr) individuals, the expected ratio of red:pink:white-flowered offsprings is 1:2:1. Biologists did two cross experiments, and ask whether the results differ significantly from the expected.
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section: Chapter Questions
Problem 8CR
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In a flowering plant species, snapdragons, variation in flower color is determined by a single gene. RRgenotype individuals are red, Rrgenotype individuals are pink, and rr genotype individuals are white. In a cross between two heterozygous (Rr) individuals, the expected ratio of red:pink:white-flowered offsprings is 1:2:1. Biologists did two cross experiments, and ask whether the results differ significantly from the expected.
(a) The first cross experiment ends up with 40 offsprings, including 10 red, 21 pink, and 9 white.
- Write the null and alternative hypothesis for the chi-square test.
- Use R to conduct the chi-square and determine the p-value. (The expected proportion must sum up to one)
- Interpret the p-value and state the conclusion from your test.
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