Question 1

Which of the following best describes the difference between asexual and sexual reproduction?

Accepted Answer

Asexual reproduction produces genetically identical offspring from a single parent, while sexual reproduction produces genetically varied offspring from two parents.

Question 2

In humans, what is the haploid number of chromosomes found in gametes?

Accepted Answer

$$n = 23$$

Question 3

Which process is responsible for producing gametes in humans?

Accepted Answer

Meiosis

Question 4

What is the result of fertilization in the human life cycle?

Accepted Answer

A diploid zygote

Question 5

Which of the following mechanisms does NOT contribute to genetic variation in sexually reproducing organisms?

Accepted Answer

Replication of DNA during mitosis

Question 6

If a human somatic cell contains 46 chromosomes, how many chromosomes will be present in a human gamete?

Accepted Answer

$$23$$

Question 7

Which term describes a group of genetically identical individuals produced from a single parent?

Accepted Answer

Clone

Question 8

During meiosis, what is the significance of crossing over?

Accepted Answer

It increases genetic variation by exchanging DNA between homologous chromosomes.

Question 9

Which of the following best explains the concept of independent assortment?

Accepted Answer

Each pair of chromosomes sorts maternal and paternal homologs into daughter cells independently of the other pairs.

Question 10

How many possible combinations of chromosomes can be produced in human gametes due to independent assortment alone?

Accepted Answer

$$2^{23}$$

Question 11

Which of the following is true about homologous chromosomes?

Accepted Answer

They carry genes controlling the same inherited characters.

Question 12

What is the primary difference between mitosis and meiosis?

Accepted Answer

Mitosis produces two identical cells, while meiosis produces four genetically distinct cells.

Question 13

Which of the following is a source of genetic variation in sexually reproducing organisms?

Accepted Answer

All of the above

Question 14

What is the role of chiasmata during meiosis?

Accepted Answer

They are points where crossing over occurs between homologous chromosomes.

Question 15

Which statement about sex chromosomes in humans is correct?

Accepted Answer

Females have two X chromosomes, and males have one X and one Y chromosome.

Question 16

A zygote is formed by the union of two gametes. What is the chromosome number of a human zygote?

Accepted Answer

$$2n = 46$$

Question 17

Which of the following best describes the process of random fertilization?

Accepted Answer

Any sperm can fertilize any egg, increasing genetic variation.

Question 18

Which phase of meiosis is characterized by the separation of homologous chromosomes?

Accepted Answer

Anaphase I

Question 19

What is the genetic relationship between the four daughter cells produced by meiosis?

Accepted Answer

They are genetically distinct from each other and from the parent cell.

Question 20

Which of the following is NOT a property of meiosis compared to mitosis?

Accepted Answer

Meiosis produces genetically identical cells.

Meiosis and Sexual Life Cycles: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards