Hey guys! I'm a little stuck with this question, with calculating the total genetic variance I'm not sure whether my answers are correct.
(VG = VA + VD = VI
(Broad sense heritability) H2 = VG/VP
(Narrow Sense heritability) h2 = VA/VP
(Response to Selection) R = h2 x s
A plant breeder has determined the following variances for yield of corn:
Total phenotypic variance 100
Additive genetic variance 30
Dominance genetic variance 50
Environmental variance 20
Assume that there is no genetic-environmental interaction or other variances. a) Calculate the total genetic variance.
b) Calculate the broad-sense heritability indicated by these results.
c) Calculate the narrow-sense heritability indicated by these results.
d) The breeder wishes to improve yield. The average yield in the starting population is 400. Plants with an average yield of 500 are selected for breeding. What is the expected average yield among the offspring of the selected plants?
Hey guys! I'm a little stuck with this question, with calculating the total genetic variance I'm not sure whether my answers are correct.
(VG = VA + VD = VI
(Broad sense heritability) H2 = VG/VP
(Narrow Sense heritability) h2 = VA/VP
(Response to Selection) R = h2 x s
A plant breeder has determined the following variances for yield of corn:
Total phenotypic variance 100
Additive genetic variance 30
Dominance genetic variance 50
Environmental variance 20
Assume that there is no genetic-environmental interaction or other variances. a) Calculate the total genetic variance.
b) Calculate the broad-sense heritability indicated by these results.
c) Calculate the narrow-sense heritability indicated by these results.
d) The breeder wishes to improve yield. The average yield in the starting population is 400. Plants with an average yield of 500 are selected for breeding. What is the expected average yield among the offspring of the selected plants?
Related textbook solutions
Related questions
1. Clover tongue is the ability to roll ones tongue into threedistinct lobes and is probably inherited as a dominant, simpleMendelian trait. In a population 90.25% of individuals can NOT rolltheir tongue into a clover tongue (i.e. they do not possess theclover tongue trait). What is the expected frequency ofheterozygous individuals in this population?
| 0.9500 |
| 0.9025 |
| 0.0950 |
| 0.0025 |
2. Assume that in the F2 of a series of crosses, 1/256 of theoffspring resemble one of the parents. How many gene loci areinvolved in producing these results?
| 8 |
| 6 |
| 4 |
| 3 |
3. Assume that three gene loci are involved in determiningphenotypes of F2 in an additive manner. How many phenotypic classesare expected?
| 9 |
| 8 |
| 7 |
| 6 |
| 4 |
| 2 |
4. The following values were estimated for corolla length in apopulation of honey-suckle. What is the narrow-sense heritabilityfor this trait in the population?
VE = 4.2
VA = 2.6
VD = 0.9
VI = 0.3
5. Toxin levels were measured in milkweed plants from a largecornfield in Iowa and found to have a mean level of 28.2 mg pergram and a variance of 15.3. Seeds were collected from these plantsand germinated in a single, large greenhouse allowing all plants togerminate and grow under identical environmental conditions. Atmaturity, toxin levels were assessed across all of these plants.The mean toxin level was 33.2 mg per gram with a variance of 8.70.What is the estimated broad-sense heritability for this trait inthis cornfield population of milkweed? Remember that H2= broad-sense heritability = VG/VP.
