Question 1

If two heterozygous parents (Yy) have three offspring, what is the probability that all three offspring will be homozygous recessive (yy)?

Accepted Answer

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

Question 2

Which rule is used to calculate the probability that two independent events will both occur together?

Accepted Answer

Rule of Multiplication

Question 3

In a monohybrid cross between two heterozygous parents (Yy x Yy), what is the probability that an offspring will be either homozygous dominant (YY) OR homozygous recessive (yy)?

Accepted Answer

$$\frac{1}{2}$$

Question 4

A blue-eyed female (homozygous recessive) and a brown-eyed male (heterozygous) have two children. What is the probability that one child will have blue eyes AND one will have brown eyes? (Assume eye color is determined by a single gene.)

Accepted Answer

$$\frac{1}{2}$$

Question 5

A homozygous dominant male (YY) has a child with a heterozygous female (Yy). What is the probability that the child will have the same genotype as either parent?

Accepted Answer

$$1$$

Question 6

If you flip two coins, what is the probability that both will land heads up?

Accepted Answer

$$\frac{1}{4}$$

Question 7

Which of the following best describes the Rule of Addition in probability?

Accepted Answer

It is used to calculate the probability of either of two mutually exclusive events occurring.

Question 8

In a genetic cross, the probability of an offspring being homozygous dominant is $$\frac{1}{4}$$ and homozygous recessive is $$\frac{1}{4}. $$What is the probability that an offspring will be either homozygous dominant OR homozygous recessive?

Accepted Answer

$$\frac{1}{2}$$

Question 9

If the probability of a child inheriting a certain allele from one parent is $$\frac{1}{2}$$, and from the other parent is $$\frac{1}{2}$$, what is the probability the child will inherit both alleles?

Accepted Answer

$$\frac{1}{4}$$

Question 10

A plant with genotype Yy is crossed with another Yy plant. What is the probability that the offspring will be heterozygous?

Accepted Answer

$$\frac{1}{2}$$

Question 11

If two events are independent, how do you calculate the probability that both will occur?

Accepted Answer

Multiply their probabilities

Question 12

In a Punnett square for a monohybrid cross, what is the probability of producing a homozygous offspring?

Accepted Answer

$$\frac{1}{2}$$

Question 13

If a heterozygous parent (Yy) is crossed with a homozygous recessive parent (yy), what is the probability that the offspring will be heterozygous?

Accepted Answer

$$\frac{1}{2}$$

Question 14

A couple, both heterozygous for a trait, have two children. What is the probability that both children will be homozygous recessive?

Accepted Answer

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

Question 15

Which scenario best illustrates the use of the Rule of Multiplication in genetics?

Accepted Answer

Calculating the probability of an offspring inheriting two independent traits

Question 16

If the probability of a child being homozygous dominant is $$\frac{1}{4}$$, and the probability of being homozygous recessive is $$\frac{1}{4}$$, what is the probability that the child is NOT heterozygous?

Accepted Answer

$$\frac{1}{2}$$

Question 17

In a cross between two heterozygous parents, what is the probability that an offspring will be either homozygous dominant or heterozygous?

Accepted Answer

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

Question 18

A heterozygous parent (Yy) and a homozygous dominant parent (YY) have a child. What is the probability that the child will be homozygous dominant?

Accepted Answer

$$\frac{1}{2}$$

Question 19

If you flip two coins, what is the probability that at least one will land heads up?

Accepted Answer

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

Question 20

In a Punnett square, which probability calculation would you use to determine the chance of an offspring being either YY or Yy?

Accepted Answer

Rule of Addition

Probability in Genetics: Punnett Squares and Probability Rules

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