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University of South Florida PCB 3063 Quiz 6 1)Polygenic inheritance gives rise to quantitative traits that vary along a continuum or a gradient

Biology

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University of South Florida

PCB 3063

Quiz 6

1)Polygenic inheritance gives rise to quantitative traits that vary along a continuum or a gradient.

  True

 False

 

2. In polygenic inheritance, the phenotype of an allele of one gene depends on the action of alleles of other genes.

True

  False

 

3. In polygenic inheritance, genes are typically equivalent in their contributions.

  True

False

 

4. How does polygenic inheritance differ from pleiotropy?

In polygenic inheritance the same gene affects multiple traits, while in pleiotropy multiple genes affect a single trait.

  In polygenic inheritance multiple genes affect a single trait, while in pleiotropy the same gene affects multiple traits.

Polygenic inheritance applies only to hereditary diseases, whereas pleiotropy does not

 

Polygenic inheritance applies only to animals, whereas pleiotropy does not They are one and the same!

 

5. Assuming a case of polygenic inheritance with additive alleles, where there are seven genes involved, how many phenotypic classes are expected?

7

10

13

  15

none of these choices

 

6. Skin color in humans is a continuous trait. Assuming the parental cross is AABBCC x aabbcc, what is the number of possible skin colors in the F2?

4

6

  7 8

16

 

7. In a certain plant, branch length is under the control of three genes. Branches can be absent or 1-6 cm long. Which of the following genotypes are possible for branches that are 3 cm?

  AaBbCc

aaBBcc

AABBcc

AAbbCC

more than one of the above

 

8. In a certain plant, branch length is under the control of three genes. Branches can be absent or 1-6 cm long. In a cross of AaBbcc x AAbbCc plants, what proportion of the progeny will have NO branches?

1/2

1/4

1/8

1/16

  choose this answer if all of the offspring will have branches

 

9. In a certain plant, branch length is under the control of three genes. Branches can be absent or 1-6 cm long.Which of the following crosses can produce a plant having branches of 6 cm?

AaBBcc x AAbbcc

 AABBcc x AaBbCC

AaBbCC x AAbbCC

  AaBbCC x AaBBCc

 none of the above

 

 

10. In the mythical beast Bigfootus flatnosus, horn length is an example of continuous variation, under polygenic control. Horns could be = 1, 3, 5, 7, 9, 11, 13, 15 or 17 centimeters long. How many genes are involved?

2

3

  4

5

6

 

11. In the mythical beast Bigfootus flatnosus, horn length is an example of continuous variation, under polygenic control. Horns could be = 1, 3, 5, 7, 9, 11, 13, 15 or 17 centimeters long. How many different genotypes code for horns that are 3 centimeters long?

  4

5

6

7

8

 

12. The weight of a particular animal is controlled by four genes. Individual animals can be 10, 20, 30, 40, 50, 60, 70, 80 or 90 kilograms. What is the weight of an animal that has genotype AabbccDd?

10 kg

20 kg

  30 kg

 40 kg

50 kg

 

13. The weight of a particular animal is controlled by four genes. Individual animals can be 10, 20, 30, 40, 50, 60, 70, 80 or 90 kilograms. Garfield has genotype AABbCcdd, and Pluto has genotype aabbCCDD. Who is heavier?

Garfield Pluto

Both have the same weight of 30 kg

 Both have the same weight of 40 kg

  none of the above is true

 

14. The weight of a particular animal is controlled by four genes. Individuals can be 10, 20, 30, 40, 50, 60, 70, 80 or 90 kilograms. What is the lightest offspring that can be produced from a cross of AaBBCCDd x aabbCcDd animals?

  30 kg 40 kg

50 kg

 

60 kg

 

15. The weight of a particular animal is controlled by four genes. Individuals can be 10, 20, 30, 40, 50, 60, 70, 80 or 90 kilograms. Assuming the parental cross is AABBCCDD x aabbccdd, what proportion of the F2 generation will weigh 90 kg?

1/16

1/32

1/64

1/128

  none of these choices