Question 1

Which of the following best describes the difference between mitosis and meiosis as illustrated in the provided diagrams?

Accepted Answer

Meiosis produces four haploid cells with genetic variation, while mitosis produces two diploid cells identical to the parent.

Question 2

In the diagram showing metaphase I of meiosis, what is the significance of homologous chromosomes lining up in pairs at the metaphase plate?

Accepted Answer

It facilitates independent assortment, increasing genetic variation in gametes.

Question 3

Referencing the diagram of crossing over during prophase I, which event is responsible for the exchange of genetic material between homologous chromosomes?

Accepted Answer

Chiasmata formation

Question 4

A cell with chromosomes shaded in two colors (red and blue) is shown. What do the colors represent, and what is the biological significance?

Accepted Answer

The colors represent maternal and paternal origin, illustrating homologous chromosomes.

Question 5

If a dog’s muscle cell contains 78 chromosomes, how many chromosomes will be found in its sperm cell after meiosis?

Accepted Answer

39

Question 6

Which process is responsible for reducing the chromosome number from diploid ($$2n) to $$haploid ($$n) in $$sexually reproducing organisms?

Accepted Answer

Meiosis

Question 7

During meiosis I, what separates to ensure each daughter cell receives only one chromosome from each homologous pair?

Accepted Answer

Homologous chromosomes

Question 8

Which event unique to meiosis occurs during prophase I and is illustrated in the crossing over diagram?

Accepted Answer

Synapsis and formation of the synaptonemal complex

Question 9

What is the formula for calculating the number of possible gametes due to independent assortment in humans, and what is the value?

Accepted Answer

The formula is $$2^n$$, where $$n is $$the number of homologous pairs. For humans, $$n = 23$$, so $$2^{23} = 8$$,388,608$$ possible gametes.

Question 10

Which of the following best explains why sexual reproduction is advantageous in changing environments?

Accepted Answer

It increases genetic variation, enhancing adaptability to new conditions.

Question 11

What is the main purpose of meiosis in the sexual life cycle?

Accepted Answer

To reduce the chromosome number by half and generate genetic diversity.

Question 12

Which term describes the location of a gene on a chromosome?

Accepted Answer

Locus

Question 13

In the context of meiosis, what is the significance of random fertilization?

Accepted Answer

It increases genetic diversity by combining unique gametes from each parent.

Question 14

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

Accepted Answer

Mitosis of somatic cells

Question 15

What separates during meiosis II, and what is the result?

Accepted Answer

Sister chromatids separate, resulting in haploid cells.

Question 16

Which of the following best describes a recombinant chromosome?

Accepted Answer

A chromosome that has undergone crossing over, containing segments from both parents.

Question 17

During which stage of meiosis does crossing over occur, and what is its effect?

Accepted Answer

Prophase I; it increases genetic variation by exchanging DNA between homologous chromosomes.

Question 18

Which cell type is diploid ($$2n) in $$humans?

Accepted Answer

Somatic cell

Question 19

What is the role of the synaptonemal complex during meiosis?

Accepted Answer

It attaches homologous chromosomes together during synapsis.

Question 20

Which of the following statements about homologous chromosomes is correct?

Accepted Answer

They carry the same genes at the same loci but may have different alleles.

Study Guide: Meiosis and Sexual Life Cycles

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