Question 1

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

Accepted Answer

Asexual reproduction produces genetically identical offspring from a single parent, while sexual reproduction produces genetically diverse offspring through the fusion of gametes.

Question 2

Which process is responsible for the replacement of damaged or lost cells in multicellular organisms?

Accepted Answer

Mitosis

Question 3

In prokaryotic cells, what is the correct sequence of events during binary fission?

Accepted Answer

Chromosome duplication, cell elongation, separation of daughter cells

Question 4

During which phase of the eukaryotic cell cycle does DNA replication occur?

Accepted Answer

S phase

Question 5

What is the role of the mitotic spindle during mitosis?

Accepted Answer

It organizes the chromosomes and separates sister chromatids.

Question 6

Which checkpoint in the cell cycle is most critical for preventing the division of cells with damaged DNA?

Accepted Answer

G1 checkpoint

Question 7

A researcher observes a cell with chromosomes aligned at the metaphase plate, spindle fibers attached to kinetochores, and no nuclear envelope. Which stage of mitosis is this cell in?

Accepted Answer

Metaphase

Question 8

In animal cells, cytokinesis is accomplished by which of the following mechanisms?

Accepted Answer

Constriction of the cell forming a cleavage furrow

Question 9

Which of the following statements about cancer cells is correct?

Accepted Answer

Cancer cells divide uncontrollably and ignore normal regulatory signals.

Question 10

If a human somatic cell undergoes mitosis, how many chromosomes will each daughter cell have?

Accepted Answer

$$46$$

Question 11

Which event during meiosis increases genetic variation by exchanging segments between nonsister chromatids?

Accepted Answer

Crossing over

Question 12

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

Accepted Answer

$$2^{23}$$

Question 13

A karyotype is most useful for detecting which of the following?

Accepted Answer

Abnormal numbers or structures of chromosomes

Question 14

Which syndrome is associated with a karyotype showing 47 chromosomes, including three copies of chromosome 21?

Accepted Answer

Down syndrome

Question 15

What is the result of nondisjunction during meiosis II?

Accepted Answer

Some gametes have an extra chromosome, and some are missing one

Question 16

Which of the following best explains why polyploidy is more common in plants than in animals?

Accepted Answer

Plants can tolerate extra sets of chromosomes, which can lead to new species.

Question 17

A patient is diagnosed with chronic myelogenous leukemia (CML). Which chromosomal event is most likely responsible?

Accepted Answer

Reciprocal translocation

Question 18

Which of the following equations correctly calculates the number of possible gamete combinations due to independent assortment for an organism with $$n$$ homologous pairs?

Accepted Answer

$$2^n$$

Question 19

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

Accepted Answer

Binary fission

Question 20

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

Accepted Answer

Mitosis results in genetically identical cells, while meiosis results in genetically diverse cells.

The Cellular Basis of Reproduction and Inheritance

Guida di studio - Domande di pratica

Study guide - Flashcard