Question 1

In a cross between two dihybrid pea plants (RrGg x RrGg), what is the probability that an offspring will have the genotype RrGg?

Accepted Answer

$$\frac{4}{16}$$

Question 2

If you roll two six-sided dice, what is the probability of rolling a 3 on the first die and a 4 on the second die?

Accepted Answer

$$\frac{1}{36}$$

Question 3

A plant with genotype AaBbCC is crossed with a plant with genotype AABbCc. How many different types of gametes can the first parent produce?

Accepted Answer

4

Question 4

In a family with four children, what is the probability that all four children will be girls? Assume independence and equal probability for each sex.

Accepted Answer

$$\frac{1}{16}$$

Question 5

Which rule should you use to calculate the probability of rolling a 19 or a 20 on a twenty-sided die?

Accepted Answer

Sum rule

Question 6

If you breed two guppies with genotype MmGgEeXx, what is the probability that an offspring will have the genotype MmGGeeXx?

Accepted Answer

$$\frac{1}{64}$$

Question 7

What is the expected phenotypic ratio among the offspring of a dihybrid cross (AaBb x AaBb) assuming complete dominance?

Accepted Answer

9:3:3:1

Question 8

Which of the following statements about Mendel’s law of independent assortment is correct?

Accepted Answer

It applies only to genes on different chromosomes or far apart on the same chromosome.

Question 9

What is the probability that a yellow pea from a monohybrid cross (Gg x Gg) is heterozygous?

Accepted Answer

$$\frac{2}{3}$$

Question 10

In a cross between AABbCcDd and AaBbCcDd, what is the probability of obtaining an offspring with genotype AabbCcDd?

Accepted Answer

$$\frac{1}{32}$$

Question 11

Which of the following best describes the product rule in probability as applied to genetics?

Accepted Answer

The probability of two independent events both occurring is the product of their individual probabilities.

Question 12

If a dihybrid plant (AaBb) is self-fertilized, what proportion of the progeny will be heterozygous at one or both loci?

Accepted Answer

$$\frac{3}{4}$$

Question 13

Which of the following is a correct genotypic ratio for the F2 generation of a monohybrid cross (Gg x Gg)?

Accepted Answer

1:2:1

Question 14

A cross between AaBbCC and AABbCc produces offspring. What is the probability that an offspring will have the genotype AaBbCC?

Accepted Answer

$$\frac{1}{8}$$

Question 15

Which of the following is an example of using the sum rule in probability?

Accepted Answer

Calculating the probability of rolling a 3 or a 4 on a single die.

Question 16

In a dihybrid cross, what is the probability of obtaining an offspring with the genotype rrgg?

Accepted Answer

$$\frac{1}{16}$$

Question 17

Which of the following statements is FALSE regarding Mendelian inheritance?

Accepted Answer

The genotypic ratio for a dihybrid cross is 9:3:3:1.

Question 18

If you cross two plants with genotypes RrGg x RrGg, what is the probability that an offspring will be R_G_ (dominant for both traits)?

Accepted Answer

$$\frac{9}{16}$$

Question 19

Which method is most efficient for predicting the genotypic ratios of a tetrahybrid cross?

Accepted Answer

Forked line method

Question 20

A cross between AABbCcDd and AaBbCcDd is performed. What is the probability of obtaining an offspring with the phenotype A–B–ccdd?

Accepted Answer

$$\frac{3}{64}$$

Advanced Mendelian Genetics: Combinations, Probability, and Multigene Crosses

Study Guide - Practice Questions