Question 1

Which of the following pairs of people would provide the most useful information to geneticists, regarding the heritability of a certain trait?

Accepted Answer

Monozygotic twins separated into different households provide the most useful information because they have identical genetics, and any differences in traits can be attributed to environmental factors, allowing geneticists to better understand heritability.

Question 2

The highest point on a bell-shaped curve represents the

Accepted Answer

The highest point on a bell-shaped curve represents the mean of the population. This is because a bell-shaped curve, also known as a normal distribution, is symmetrical around the mean. The mean is the point that represents the average value of a trait in the population, and it is the most common value observed. Therefore, the highest point on the curve corresponds to the mean of the population. Choices A, B, and C are incorrect because they do not accurately describe the meaning of the highest point on a bell-shaped curve.

Question 3

What can be concluded about the ability of doctorate-category sperm to help produce children that are smarter than average?

Accepted Answer

There is currently no scientific evidence or way to predict whether children produced by doctorate-category sperm will be smarter than average. While intelligence does have a genetic component, it is influenced by many other factors, including environment and upbringing. Therefore, it is impossible to make any conclusive statements about the ability of this type of sperm to produce smarter children.

Question 4

If the estimated heritability of a trait is approximately 0.50, then

Accepted Answer

An estimated heritability of 0.50 means that at least 50% of the variation in the trait in the population is due to genetic differences, while the remaining variation is due to environmental factors. It does not mean that the environment has little to no influence or that genes exclusively control the expression of the trait in at least 50% of the population. However, it does suggest that genetic factors play a significant role in determining the trait.

Question 5

The large variation in shoe size among humans is due to a trait that is

Accepted Answer

Shoe size is a quantitative trait, meaning it is influenced by multiple genes and is expressed as a range of values rather than a discrete category.

Question 6

The difference between the lowest and highest values on the x-axis of a normal distribution curve represents the ________ for the population that is being studied.

Accepted Answer

The difference between the lowest and highest values on the x-axis of a normal distribution curve represents the range of values for the population being studied. The range is a measure of variability or dispersion of data, which is represented by the variance in a normal distribution curve. The bell-shaped curve represents the distribution of data around the mean value, which is the highest point on the curve. Frequency distribution is a way of displaying data in a table or graph that shows how often each value or range of values occurs. Therefore, the best answer is C, variance.

Question 7

-According to this graph, what can be concluded about immunity in these birds?

Accepted Answer

The answer of 
-According to this graph, what can be...

Question 8

The estimated influence of genes (as opposed to environment)on a trait is called ________.

Accepted Answer

The answer of The estimated influence of genes (as opposed...

Question 9

According to one study, the heritability of IQ score in humans has a value of 0.52. What does this tell us about the role of "nature" vs. "nurture" in determining intelligence in humans?

Accepted Answer

A heritability score of 0.52 means that about half of the variation in IQ scores can be attributed to genetic differences, but the other half is likely due to environmental factors. This suggests that while genetics do play a role in determining intelligence, the environment also has a strong influence and cannot be ignored. Therefore, high heritability values don't mean that the intelligence of children can be accurately predicted because the environment plays a strong role.

Question 10

Which of the following was a conclusion based on experiments with "maze-bright" and "maze-dull" rats?

Accepted Answer

The experiments with "maze-bright" and "maze-dull" rats concluded that a poor environment adversely affects maze-running ability in both types of rats. This suggests that the environment can play a role in cognitive ability regardless of genetic predisposition.

Question 11

A ________ trait shows continuous variation, where there is a large range of phenotypes in a population (for example, height or skin color).

Accepted Answer

The answer of A ________ trait shows continuous variation, where...

Quiz 7: Are You Only as Smart as Your Genes? Mendelian and Quantitative Genetics