EBK ESSENTIALS OF GENETICS
9th Edition
ISBN: 9780134190068
Author: Palladino
Publisher: YUZU
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Chapter 21, Problem 19PDQ
In a population of 100 inbred, genotypically identical rice plants, variance for grain yield is 4.67. What is the heritability for yield? Would you advise a rice breeder to improve yield in this strain of rice plants by selection?
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The mean and variance of plant height of two highly inbred strains (P1 and P2) and their progeny (F1 and F2) are shown here. Strain Mean (cm) Variance P1 34.2 4.2 P2 55.3 3.8 F1 44.2 5.6 F2 46.3 10.3 Calculate the broad-sense heritability (H2) of plant height in this species.
Chapter 21 Solutions
EBK ESSENTIALS OF GENETICS
Ch. 21 -
CASE STUDY | A genetic flip of the coin
On July...Ch. 21 - CASE STUDY|A genetic flip of the coin On July 11,...Ch. 21 -
CASE STUDY|A genetic flip of the coin
On July...Ch. 21 - HOW DO WE KNOW?
1. In this chapter, we focused on...Ch. 21 - Review the Chapter Concepts list on page 422....Ch. 21 -
3. Define the following: (a) polygenic, (b)...Ch. 21 - A dark-red strain and a white strain of wheat are...Ch. 21 - Height in humans depends on the additive action of...Ch. 21 -
6. An inbred strain of plants has a mean height...Ch. 21 - Prob. 7PDQ
Ch. 21 - In the following table, average differences of...Ch. 21 - What kind of heritability estimates (broad sense...Ch. 21 - List as many human traits as you can that are...Ch. 21 - Corn plants from a test plot are measured, and the...Ch. 21 -
12. The following variances were calculated for...Ch. 21 - The mean and variance of plant height of two...Ch. 21 - A hypothetical study investigated the vitamin A...Ch. 21 - In a herd of dairy cows the narrow-sense...Ch. 21 - In an assessment of learning in Drosophila, flies...Ch. 21 - Suppose you want to develop a population of...Ch. 21 -
18. In a population of tomato plants, mean fruit...Ch. 21 - In a population of 100 inbred, genotypically...Ch. 21 - In a cross between a strain of large guinea pigs...Ch. 21 - While most quantitative traits display continuous...
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- The narrow-sense heritability (hN2) for potato weight in a starting population of potato plants is 0.42, and the mean weight is 1.4 pounds. If a breeder crossed plants with average potato weights of 1.9 and 2.1 pounds,respectively, what is the predicted average weight of potatoes fromthe offspring?arrow_forwardA a soybean breeder is aiming to breed for early maturation. He was able to cross variety A which has desirable agronomic characteristics but late maturation with variety B which has less-than-ideal agronomic characteristics but early maturation. In addition to the F1 population, F2 and BC1 population were also generated. The variances for each population are presented below.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
- In a herd of dairy cattle, milk yield and the percentage of butterfat exhibit a geneticcorrelation of −0.38. If greater milk yield is selected in this herd, what will be the effecton the percentage of butterfat?arrow_forwardUpon further scrutiny of the pine beetles over generations, you discover that they have far more than 11 shades of green—in fact, they seem to have a continuous distribution of shades of green color. You take this population and breed them in two different locations: first in a terrarium in the lab, and then in a tree. In which of these two locations will you get a higher heritability value when you measure the variance of phenotypes in the next generation? a) Higher heritability value in the lab. b) The heritability value will be the same because the beetles are the same. c)Higher heritability value in the tree. d)The answer cannot be determined from the information given.arrow_forwardWhy is the narrow sense heritability more useful to plant and animal breeders than broad sere heritability?arrow_forward
- Why is the variance larger for a BC1 population compared to an F1 population?arrow_forwardWhat is the difference between broad-sense heritability and narrow-sense heritability? Why is narrow-sense heritability such auseful concept in the field of agricultural genetics?arrow_forwardSuppose that in a population of Peacocks the phenotypic variance for tail length is 2.5 and the heritability for this trait is 0.4. From a long-term captive population you also have data from a line of completely inbred individuals. In this line the phenotypic variance among individuals is 0.50. Assume that there is no epistatic variance (VI) for this trait. Calculate the following: What is the total genetic variance for tail length? What is the additive genetic variance? What is the dominance genetic variance? What is the environmental variance? What is the broad-sense heritability (H2)?arrow_forward
- The mean and variance of Corolla length in two highly strains of tabacco and their progeny are shown in the following table one parent (P1) has a short corolla and the other parent ( P2) have a long corolla calculate the broad sense heritability (H) of Corolla length in the plant Strain. Mean(mm). Variance (mm) P1 short 40.47. 3.12 P2 long. 93.75. 3.87 F1(P1×P2). 63.90. 4.74 F2(F1×F2). 68.72. 47.70arrow_forwardOrchids come in an amazing variety of colours. Scientists found that cloned Cattleya orchids have a phenotypic variance of 14, while wild Cattleya orchids have a phenotypic variance of 29. What is the broad-sense heritability of these orchids?arrow_forwardIn a wild strain of tomato plants, the phenotypic variance fortomato weight is 3.2 g2. In another strain of highly inbred tomatoesraised under the same environmental conditions, the phenotypicvariance is 2.2 g2. With regard to the wild strain,A. Estimate VG.B. What is hB2?C. Assuming that all of the genetic variance is additive, what is hN2?arrow_forward
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