Q: Which formula correctly calculates the probability of two independent events both occurring?

$$P(A \times B) = P(A) \times P(B)$$

Question 1

Where does meiosis primarily occur in the human body?

Accepted Answer

In the gonads (testes and ovaries)

Question 2

A diploid cell with 2 of every chromosome undergoes meiosis. After meiosis is complete, how many of each chromosome are present in each of the 4 resulting cells?

Accepted Answer

1 of each chromosome

Question 3

Which major event occurs during Meiosis I that does NOT occur during mitosis?

Accepted Answer

Homologous chromosomes pair and separate

Question 4

Meiosis II is very similar to mitosis in that __________ separates.

Accepted Answer

sister chromatids

Question 5

Which of the following best describes a key difference between mitosis and meiosis?

Accepted Answer

Mitosis produces two identical cells, meiosis produces four genetically unique cells

Question 6

Independent assortment refers to which of the following processes during meiosis?

Accepted Answer

The random alignment of homologous chromosomes on the metaphase plate

Question 7

If the probability of getting heads in a single coin toss is $$\frac{1}{2}$$, what is the probability of getting three heads in a row?

Accepted Answer

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

Question 8

Crossing over during meiosis results in which of the following?

Accepted Answer

Exchange of genetic material between homologous chromosomes

Question 9

Which process increases genetic variation by shuffling genes located on different chromosomes?

Accepted Answer

Independent assortment

Question 10

What is the term for the failure of chromosomes to separate properly during meiosis?

Accepted Answer

Nondisjunction

Question 11

Trisomy 21 (Down's syndrome) is most often the result of nondisjunction occurring in which parent?

Accepted Answer

Mother

Question 12

During meiosis, how does crossing over contribute to genetic diversity?

Accepted Answer

By exchanging DNA between homologous chromosomes

Question 13

A cell with 8 chromosomes undergoes meiosis. How many chromosomes will each gamete contain after meiosis?

Accepted Answer

4

Question 14

Which phase of meiosis is responsible for the separation of homologous chromosomes?

Accepted Answer

Anaphase I

Question 15

If a nondisjunction event occurs during meiosis II, what is the possible outcome for the gametes?

Accepted Answer

Some gametes will have an extra chromosome, some will have one less

Question 16

Which of the following best explains why siblings from the same parents can look very different from each other?

Accepted Answer

Because meiosis and fertilization introduce genetic variation through independent assortment and crossing over

Question 17

If a diploid cell contains $$2n = 6$$ chromosomes, after meiosis, each gamete will contain how many chromosomes?

Accepted Answer

$$3$$

Question 18

Which of the following events occurs only during meiosis and not during mitosis?

Accepted Answer

Pairing of homologous chromosomes

Question 19

A woman with nondisjunction in one of her egg cells produces an egg with two copies of chromosome 21. If fertilized by a normal sperm, what will be the chromosome number for chromosome 21 in the resulting zygote?

Accepted Answer

Three

Question 20

Which formula correctly calculates the probability of two independent events both occurring?

Accepted Answer

$$P(A 	imes B) = P(A) 	imes P(B)$$

Meiosis, Mitosis, and Chromosomal Inheritance: Study Guide

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