Practice Quiz for General Genetics
Chapter 22 -- Quantitative Genetics

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1. In a cross between F1s, it is found that the extreme phenotype occurs about 1 out of every 4000 offspring. The number of loci that control this trait is
A. 2
B. 5
C. 4
D. 6
E. 3

2. Given that G (effect due to genetics) = 0.50, E1 (effect due to individual differences) = 0.10, and E2 (effect due to familial differences) = 0.40, which of the following pairs of individuals will be most similar in ability to score high on an IQ test.
A. siblings reared apart
B. grandson - grandfather
C. dizygotic twins reared together
D. monozygotic twins reared apart

3. Given 1 locus with 2 alleles that are strictly additive, the additive genetic variance (2pqa^2) is at a maximum when
A. q = 0.5
B. q = 1.0
C. q = 0.0
D. p = 0.25

4. In a population of flies the mean bristle number was 6.4. Three pairs of flies were used as parents and their mean bristle number was 7.2. Their offspring had a mean bristle number of 7.0. What was the realized heritability?
A. 0.75
B. 0.25
C. 0.91
D. 0.86

5. A measure of dispersion about the mean in a population is the
A. covariance
B. average
C. correlation
D. variance

6. At the D locus, there are two alleles with "D" incompletely dominant to "d". Population A has a frequency of the "D" allele equal to 0.6 (p = 0.6), while population B has a frequency of the "D" allele equal to 0.8 (p = 0.8). Which of the following statements is true?
A. Va is greater in population B
B. Va is greater in population A
C. Va is equal in both populations
D. No conclusion can be drawn about the variance of either population.

7. To determine if there is a relationship between two variables such that as one variable changes the other also changes, we would calculate a
A. variance
B. standard error
C. correlation coefficient
D. coefficient of variation

8. In the P generation we crossed a red-flowered and white-flowered plant to get an F1 generation that was intermediate in color (pink) between the two parents. The F1s were then crossed to produce an F2. Which of the following will have the largest phenotypic variance?
A. the red-flowered P generation
B. the white-flowered P generation
C. the F1 generation
D. the F2 generation

9. A population of raccoons living in the Flint Hills was studied. It was found that for lean body mass hn^2 equals 0.65, Vp equals 120, and Vd equals Ve equals 10. What does VG equal?
A. 78
B. 22
C. 42
D. 98

10. If our population of raccoons was supplemented with food in such a way that each individual now had the same amount of food available to it, we would expect that
A. hn^2 would increase
B. hn^2 would decrease
C. Va would increase
D. VG would decrease

Last updated on 24 September 2004.
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