Question 1

Which of the following best describes the difference between asexual and sexual reproduction in terms of genetic inheritance?

Accepted Answer

Asexual reproduction produces offspring genetically identical to the parent, while sexual reproduction results in genetic variation among offspring.

Question 2

In humans, which cells are diploid and which are haploid?

Accepted Answer

Somatic cells are diploid $$(2n = 46)$$, and gametes are haploid $$(n = 23).$$

Question 3

Why must fertilization and meiosis alternate in all sexual life cycles?

Accepted Answer

To maintain a constant chromosome number across generations.

Question 4

Which of the following events occurs during meiosis I but NOT during mitosis?

Accepted Answer

Synapsis and crossing over between homologous chromosomes.

Question 5

During prophase I of meiosis, what is the significance of the synaptonemal complex?

Accepted Answer

It holds homologous chromosomes together tightly, facilitating crossing over.

Question 6

Which mechanism is responsible for the independent assortment of chromosomes during meiosis?

Accepted Answer

Homologous chromosomes orient randomly at the metaphase plate during metaphase I.

Question 7

How many possible combinations of chromosomes can result from independent assortment in human gametes?

Accepted Answer

More than 8 million $$(2^{23}$$)$$.

Question 8

Which of the following best explains how crossing over contributes to genetic variation?

Accepted Answer

It produces recombinant chromosomes that combine DNA from both parents.

Question 9

What is the result of meiosis in terms of chromosome number and genetic diversity?

Accepted Answer

Four daughter cells, each with half the chromosome number and genetically distinct from each other and the parent cell.

Question 10

Which of the following is a key difference between autosomes and sex chromosomes in humans?

Accepted Answer

Sex chromosomes determine the sex of the individual, while autosomes carry genes for inherited characters.

Question 11

In plants exhibiting alternation of generations, which stage is diploid and which is haploid?

Accepted Answer

Sporophyte is diploid, gametophyte is haploid.

Question 12

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

Accepted Answer

Any sperm can fuse with any ovum, resulting in a zygote with a unique genetic identity.

Question 13

Which equation represents the number of possible chromosome combinations due to independent assortment in gametes?

Accepted Answer

$$2^n$$

Question 14

During which phase of meiosis do homologous chromosomes separate?

Accepted Answer

Anaphase I

Question 15

A mutation occurs in a gene during DNA replication. What is the most likely consequence for the offspring?

Accepted Answer

The offspring will have a new allele that may contribute to genetic variation.

Question 16

Which of the following is NOT a mechanism that contributes to genetic variation in sexually reproducing organisms?

Accepted Answer

Replication of chromosomes during interphase

Question 17

If a cell with a diploid number of 8 $$(2n = 8)$$ undergoes meiosis, how many chromosomes will each daughter cell have?

Accepted Answer

4

Question 18

Which of the following best describes the role of cohesins during meiosis?

Accepted Answer

Cohesins hold sister chromatids together until they are separated during anaphase II.

Question 19

Which of the following scenarios illustrates the concept of independent assortment?

Accepted Answer

A child inherits brown eyes from one parent and blond hair from the other, showing that traits are inherited independently.

Meiosis and the Sexual Life Cycle: Mechanisms, Stages, and Genetic Variation

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