Question 1

Which of the following best describes the difference between a diploid cell and a haploid cell?

Accepted Answer

A diploid cell contains two sets of chromosomes, while a haploid cell contains one set of chromosomes.

Question 2

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

Accepted Answer

Crossing over occurs during prophase I and increases genetic diversity by exchanging genetic material between homologous chromosomes.

Question 3

If a diploid organism has 36 chromosomes, how many chromosomes will be present in each gamete after meiosis?

Accepted Answer

$$18$$

Question 4

Which process is responsible for the separation of homologous chromosomes?

Accepted Answer

Anaphase I of meiosis

Question 5

Which of the following is NOT a source of genetic variation in sexually reproducing organisms?

Accepted Answer

Binary fission

Question 6

A karyotype is useful for which of the following purposes?

Accepted Answer

Identifying chromosomal abnormalities such as trisomy 21

Question 7

Which event occurs during metaphase I of meiosis?

Accepted Answer

Tetrads align at the metaphase plate

Question 8

What is the result of nondisjunction during meiosis?

Accepted Answer

Gametes with abnormal numbers of chromosomes

Question 9

Which of the following best explains why Down syndrome occurs?

Accepted Answer

An individual has three copies of chromosome 21 due to nondisjunction.

Question 10

Which process is unique to meiosis and does NOT occur in mitosis?

Accepted Answer

Formation of tetrads and crossing over

Question 11

Which of the following statements about bacterial genetic diversity is correct?

Accepted Answer

Bacteria can acquire new genes through transformation, conjugation, and transduction.

Question 12

Which of the following best describes independent assortment?

Accepted Answer

The random orientation of homologous chromosome pairs during metaphase I, leading to genetic variation.

Question 13

A scientist observes a cell with 46 chromosomes undergoing meiosis. How many genetically unique gametes can be produced due to independent assortment alone? (Assume no crossing over.)

Accepted Answer

$$2^{23}$$

Question 14

Which of the following is a correct sequence of events during meiosis II?

Accepted Answer

Prophase II, metaphase II, anaphase II, telophase II

Question 15

Which of the following is NOT a function of mitosis?

Accepted Answer

Production of gametes for sexual reproduction

Question 16

Which process involves the transfer of genetic material from the environment into a bacterial cell?

Accepted Answer

Transformation

Question 17

A patient is diagnosed with a genetic disorder caused by a missing chromosome. Which meiotic error most likely occurred?

Accepted Answer

Nondisjunction

Question 18

Which of the following statements about homologous chromosomes is correct?

Accepted Answer

They contain the same genes in the same order but may have different alleles.

Question 19

Which of the following best describes the outcome of meiosis?

Accepted Answer

Four genetically different haploid cells

Question 20

Which process involves a virus transferring genetic material between bacteria?

Accepted Answer

Transduction

Meiosis and Sexual Life Cycles: Mechanisms and Genetic Variation

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