Genetics: From Genes to Genomes
6th Edition
ISBN: 9781259700903
Author: Leland Hartwell Dr., Michael L. Goldberg Professor Dr., Janice Fischer, Leroy Hood Dr.
Publisher: McGraw-Hill Education
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Chapter 22, Problem 2P
Suppose you grew genetically identical dandelion seeds in an environmentally controlled environment like a greenhouse.
| a. | Sketch the distribution of stem length |
| b. | Why would you expect to see a phenotypic variance greater than zero for these genetically identical dandelions grown in a constant environment? |
| c. | How could you use this information to refine the estimate of genetic variance shown originally in Fig. 22.5b? |
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Corn plants from a test plot are measured, and the distribution of heights at 10-cm intervals is recorded in the following table: Height (cm) Plants (no.) 100 20 110 60 120 90 130 130 140 180 150 120 160 70 170 50 180 40 Calculate (a) the mean height, (b) the variance, (c) the standard deviation, and (d) the standard error of the mean. Plot a rough graph of plant height against frequency. Do the values represent a normal distribution? Based on your calculations, how would you assess the variation within this population?
Solve this problem using a punnett square.
Problem:
The trait for stem length in plant Z is controlled by 3 pairs of genes. Assume that stem length in a plant is controlled by three gene pairs and that each additive allele contributes 15 cm to a base stem length of 10 cm.
a. What is the height of an AaBbCC plant?
b. Predict the phenotypic ratio of Fl plants in a cross between AaBbcc and AaBBcc.
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The mean, standard deviation, variances, and coefficient of variance of plant height from two rice plants (P1 and P2) and their progeny (F1 and F2) and a backcross generation (P1 x F1) are shown below. Explain the possible reasons for the observed differences in the sample means. Account for the differences in the sample means of P1 and P2. Similarly, account for the differences in the sample means of the F1 and F2. Compare the difference in the parental generations with that in the filial generations.
Chapter 22 Solutions
Genetics: From Genes to Genomes
Ch. 22 - Choose the best matching phrase in the right...Ch. 22 - Suppose you grew genetically identical dandelion...Ch. 22 - How can each of the following be used in...Ch. 22 - Two different groups of scientists studying a rare...Ch. 22 - Which of the following statements would be true of...Ch. 22 - Studies have indicated that for pairs of twins...Ch. 22 - Prob. 7PCh. 22 - Prob. 8PCh. 22 - Table 22.2 lists concordance values for MZ and DZ...Ch. 22 - Prob. 10P
Ch. 22 - Prob. 11PCh. 22 - Two alleles at one locus produce three distinct...Ch. 22 - In a certain plant, leaf size is determined by...Ch. 22 - Compare and contrast the use of SNP genotyping: i...Ch. 22 - Explain the similarities and differences between...Ch. 22 - In Fig. 22.14c, the fw2.2 causal gene was...Ch. 22 - Among the most prevalent pathologies that afflict...Ch. 22 - Human geneticists have found the Finnish...Ch. 22 - Canavan disease, caused by homozygosity for a...Ch. 22 - In GWAS analysis, because of the existence of LD...Ch. 22 - In Fig. 22.15: a. Why do some chromosomes in the...Ch. 22 - Consider the triangle diagram shown in Fig. 22.17....Ch. 22 - Prob. 23PCh. 22 - You conduct a Case/Control study comparing the...Ch. 22 - Prob. 25PCh. 22 - ALS amyotrophic lateral sclerosis is a rare, fatal...Ch. 22 - Through GWAS explorations, scientists have...Ch. 22 - In domesticated dogs, size has a high...Ch. 22 - Suppose a GWAS investigation found a particular LD...Ch. 22 - In 2008, Time magazine named as its invention of...
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- A wide-ranging survey of Nicotonia growing in its natural environment recorded a variation in corolla length ranging from 12mm to 47mm with a variance of 36.5. Subsequently, collected seeds were grown in a greenhouse and it was found that the range was now very much lower with most plants having similar corolla lengths and the variance was now only 8.4. After the plants had grown to maturity and formed seed, seeds were collected from plants with either the shortest and or the longest corollas in the population and planted separately in the greenhouse. When flowers were formed it was found that the variance of the plants with the shortest flowers was now 4.2 while that of the flowers from the longest seeds had become 13.7 Thus, calculate the new values for heritability in the different groups of plants and explain why this difference may arise.arrow_forwardTwo different varieties of potato plants produce potatoes with thesame mean weight of 1.5 pounds. One variety has a very low variancefor potato wieght, and the other has a much higher variance. A. Discuss the possible reasons for the differences in variance.B. If you were a potato farmer, would you rather raise a varietywith a low or high variance? Explain your answer from apracticalpoint of view.C. If you were a potato breeder and you wanted to develop potatoeswith a heavier weight, would you choose the variety witha low or high variance? Explain your answer.arrow_forwardSuppose you grew genetically identical dandelion seeds in an environmentally controlled environment like a greenhouse.Why would you expect to see a phenotypic variance greater than zero for these genetically identical dandelions grown in a constant environment?arrow_forward
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