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Short Answer Quiz
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1

Define quantitative genetics.
2

List two types of quantitative traits.
3

How do quantitative traits differ from discontinuous traits?
4

Some instructors "curve" exam scores based on the assumption that the grades in a course should follow a normal distribution curve. Would you prefer that your instructors did this, or not?
5

A study of a vole population measured tail length of a number of individuals. What is the mean tail length of the voles analyzed in this study?
Individual 1: 1.4 cm
Individual 2: 1.6 cm
Individual 3: 1.2 cm
Individual 4: 1.5 cm
Individual 5: 0.9 cm
Individual 6: 1.2 cm
6

How is the variance related to the standard deviation?
7

Commercial plant breeders would like to create soybeans that are drought resistant and have increased protein levels. The correlation coefficient for drought resistance and protein levels for a large number of individuals in existing strains is -0.78. Do you expect it to be easy or difficult to create the desired soybean strain?
8

How does a regression analysis help you study a pair of variables?
9

How many different genetic loci affect hull color in wheat (Triticum aestivum)?
10

How many potential gametes could be produced by a wheat plant heterozygous for all three hull color genes?
11

In order to identify chromosomal locations of potential DDT resistance QTLs, James Crow crossed a DDT resistant strain with a DDT sensitive strain, then backcrossed the resulting F1 offspring to both of the parental strains. How would the experiment have been affected if he had only backcrossed the F1 to one of the parental strains?
12

What was the purpose of dominant genetic markers in the parental strains for James Crow's experiment to map DDT resistance QTLs?
13

How would crossing over affect the results of James Crow's experiment to map DDT resistance QTLs?
14

What assumptions underlie the equation for total variance for a trait in a group of individuals (VT); VT = VG + VE ?
15

What can you say about the value of Vg in the hybrid tomatoes that most people plant in their gardens?
16

Most people plant hybrid strains of vegetables in their home gardens. If you were to save seed from one of these hybrid vegetable plants and cultivate a population of the offspring, would you expect Vg to be low or high in that population?
17

What factors may influence heritability?
18

Give two reasons why hybrid strains of plants have benefits over inbred strains.





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