Question 1

Which of the following best explains why siblings from the same parents can look different from each other?

Accepted Answer

Independent assortment and crossing over during meiosis create unique combinations of alleles in each gamete.

Question 2

What is the primary difference between asexual and sexual reproduction?

Accepted Answer

Asexual reproduction produces genetically identical offspring, while sexual reproduction increases genetic variation among offspring.

Question 3

If a human cell has 46 chromosomes, how many chromosomes will each gamete have after meiosis?

Accepted Answer

$$23$$

Question 4

Which event during meiosis is responsible for the exchange of genetic material between homologous chromosomes?

Accepted Answer

Crossing over during prophase I

Question 5

A diploid cell with $$2n = 8$$ undergoes meiosis. How many chromosomes will each resulting gamete contain?

Accepted Answer

$$4$$

Question 6

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

Accepted Answer

Replication of DNA during mitosis

Question 7

In humans, how many possible combinations of chromosomes can result from independent assortment alone during gamete formation?

Accepted Answer

$$2^{23}$$

Question 8

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

Accepted Answer

Anaphase I

Question 9

A mutation occurs in a gene that codes for eye color. What is the most immediate result of this mutation?

Accepted Answer

A new allele is created at the gene's locus.

Question 10

Which of the following best describes the outcome of meiosis II?

Accepted Answer

Sister chromatids are separated into four genetically unique haploid cells.

Question 11

If a plant species has a diploid number of $$2n = 12$$, how many different chromosome combinations can be produced in its gametes by independent assortment?

Accepted Answer

$$2^6$$

Question 12

Which of the following is a key difference between mitosis and meiosis?

Accepted Answer

Meiosis reduces the chromosome number by half, while mitosis conserves it.

Question 13

Which process restores the diploid number of chromosomes in sexually reproducing organisms?

Accepted Answer

Fertilization

Question 14

A geneticist observes that a certain trait is always inherited together with another trait. Which explanation best accounts for this observation?

Accepted Answer

The two genes are located close together on the same chromosome and rarely separated by crossing over.

Question 15

Which of the following statements about homologous chromosomes is correct?

Accepted Answer

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

Question 16

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

Accepted Answer

Prophase I; it increases genetic variation among gametes.

Question 17

A certain fungus spends most of its life cycle as a haploid organism. Which type of sexual life cycle does it most likely exhibit?

Accepted Answer

Fungal/protist life cycle with a dominant haploid stage

Question 18

Which of the following best describes the relationship between genes, loci, and traits?

Accepted Answer

A gene is a segment of DNA at a specific locus that codes for a trait.

Question 19

If a sperm with an abnormal number of chromosomes fertilizes a normal egg, what is the most likely result?

Accepted Answer

The zygote will have an abnormal chromosome number, possibly leading to genetic disorders.

Question 20

Which of the following equations correctly represents the number of possible chromosome combinations in gametes due to independent assortment, where $$n is $$the haploid number?

Accepted Answer

$$2^n$$

Meiosis and Sexual Life Cycles (Chapter 13): Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards