GN 301 EXAM 3 UPDATED ACTUAL QUESTIONS AND
CORRECT ANSWERS
Question:
1. Quantitative traits characteristics
Answer:
- Many genes control the trait
- Effect of each gene is small
- Effects of genes add together
- The environment also influences the phenotype
- Underlying discrete genotypic distribution, but appears as a normal phenotypic distribution due to the
environmental effects.
Question:
2. Threshold traits
Answer:
problems involving additive effects of alleles
Question:
3. Select all that must be satisfied in order for a population to be at Hardy-Weinberg Equilibrium. Question
3Select one or more:a. Selection does not occur
b. Related individuals marry
c. The population is panmictic
d. Mutation does not occur
e. Migration does not occur
f. The population is infinitely large
g. p = q = 0.5
h. Genetic drift occurs
Answer:
Selection does not occur, The population is infinitely large, Migration does not occur, The population is
panmictic, Mutation does not occur
Question:
4. The type of selection that favors heterozygous individuals over homozygous individuals is called
Answer:
Stabilizing Selection
Question:
5. Mark all that are true about consanguineous unions. Question 10Select one or more:a. Increases the
frequency of recessive alleles
b. Increases the frequency of recessive phenotypes
c. Decreases the proportion of heterozygous individuals in the population
d. Increases the proportion of homozygous genotypes
e. Decreases the frequency of recessive phenotypes Feedback
, Answer:
Decreases the proportion of heterozygous individuals in the population, Increases the frequency of
recessive phenotypes, Increases the proportion of homozygous genotypes
Question:
6. Which two types of human DNA are most frequently studied when determining evolutionary
relationships?
Answer:
Y Chromosome, Mitochondrial DNA
Question:
7. The type of selection that favors one homozygous type and is least favorable for the other homozygous
type is
Answer:
Directional Selection
Question:
8. The type of selection in which both homozygous types are favored over the heterozygous type is called
Answer:
Disruptive Selection
Question:
9. Which is NOT a benefit of genetic counseling? Question 1Select one:a. Fixes all medical problems of
the patient
b. Provides an explanation and relief from uncertainty
c. Helps inform decisions about managing healthcare
d. Assists in getting services covered
e. Offers information for family members
f. Aids in planning for the future
Answer:
Fixes all medical problems of the patient
Question:
10. Which is NOT a common indication for referral to genetic counseling? Question 2Select one:a.
Unexplained intellectual and/or developmental delay
b. Recurrent pregnancy loss
c. Suspected genetic condition
d. Mother greater or equal to 25 years old at delivery
e. Non-familial dysmorphic features
f. Birth defects
g. Abnormal newborn screening
Answer:
Mother greater or equal to 25 years old at delivery
Question:
11. Angelman Syndrome is usually due to a .....
CORRECT ANSWERS
Question:
1. Quantitative traits characteristics
Answer:
- Many genes control the trait
- Effect of each gene is small
- Effects of genes add together
- The environment also influences the phenotype
- Underlying discrete genotypic distribution, but appears as a normal phenotypic distribution due to the
environmental effects.
Question:
2. Threshold traits
Answer:
problems involving additive effects of alleles
Question:
3. Select all that must be satisfied in order for a population to be at Hardy-Weinberg Equilibrium. Question
3Select one or more:a. Selection does not occur
b. Related individuals marry
c. The population is panmictic
d. Mutation does not occur
e. Migration does not occur
f. The population is infinitely large
g. p = q = 0.5
h. Genetic drift occurs
Answer:
Selection does not occur, The population is infinitely large, Migration does not occur, The population is
panmictic, Mutation does not occur
Question:
4. The type of selection that favors heterozygous individuals over homozygous individuals is called
Answer:
Stabilizing Selection
Question:
5. Mark all that are true about consanguineous unions. Question 10Select one or more:a. Increases the
frequency of recessive alleles
b. Increases the frequency of recessive phenotypes
c. Decreases the proportion of heterozygous individuals in the population
d. Increases the proportion of homozygous genotypes
e. Decreases the frequency of recessive phenotypes Feedback
, Answer:
Decreases the proportion of heterozygous individuals in the population, Increases the frequency of
recessive phenotypes, Increases the proportion of homozygous genotypes
Question:
6. Which two types of human DNA are most frequently studied when determining evolutionary
relationships?
Answer:
Y Chromosome, Mitochondrial DNA
Question:
7. The type of selection that favors one homozygous type and is least favorable for the other homozygous
type is
Answer:
Directional Selection
Question:
8. The type of selection in which both homozygous types are favored over the heterozygous type is called
Answer:
Disruptive Selection
Question:
9. Which is NOT a benefit of genetic counseling? Question 1Select one:a. Fixes all medical problems of
the patient
b. Provides an explanation and relief from uncertainty
c. Helps inform decisions about managing healthcare
d. Assists in getting services covered
e. Offers information for family members
f. Aids in planning for the future
Answer:
Fixes all medical problems of the patient
Question:
10. Which is NOT a common indication for referral to genetic counseling? Question 2Select one:a.
Unexplained intellectual and/or developmental delay
b. Recurrent pregnancy loss
c. Suspected genetic condition
d. Mother greater or equal to 25 years old at delivery
e. Non-familial dysmorphic features
f. Birth defects
g. Abnormal newborn screening
Answer:
Mother greater or equal to 25 years old at delivery
Question:
11. Angelman Syndrome is usually due to a .....
