Download Polygenic Traits Quiz

Polygenic Traits Quiz
1. True or False: Phenotypes associated with polygenic traits can be
represented by a bell-shaped curve.
true 2. True or False: Polygenic traits demonstrate a wide variation in the
phenotype.
true 3. What is polygenic inheritance?
Polygenic inheritance is inheritance of a trait that is controlled by more than one gene. 4. Human skin color is a polygenic trait. If human skin color is defined by
three genes, what would be the genotype most people.
As most people will have a moderate phenotype (the middle of a bell shaped curve), they would have 3 dominant alleles. AaBbCc, for example. 5. What will be the genotype of the darkest individuals from question 4?
AABBCC or aabbcc will result in an extreme phenotype. 6. If A, B and C represent dominant alleles of a polygenic trait, what
genotype will represent an extreme phenotype?
a) AaBbCc
b) AABbcc
c) AABBCC
d) AabbcC
7. If A, B and C represent dominant alleles of a polygenic trait, what
genotype will represent the moderate (or middle) phenotype?
a) AaBbCc
b) AAbbcc
c) AaBBCc
d) All of the above represent moderate phenotypes.
8. Which genotype will have a more extreme phenotype?
a) AaBbCc
b) AABbcc
c) aaBbCC
d) All of the above will show very similar phenotypes.
9. Human height is a polygenic trait. If individuals with more dominant
alleles are tall, what will be the genotype of a professional basketball
player.
a) nnbbaa
b) NnBbAa
c) NNBBaa
d) NNBBAA
10. In addition to skin color and height, which of the following is also a
polygenic trait?
a) freckles
b) hair color
c) eye size
d) both (b) and (c)