Question 1

Which of the following statements best describes the difference between somatic cells and gametes in humans?

Accepted Answer

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

Question 2

During which phase of meiosis do homologous chromosomes separate, and what is the result?

Accepted Answer

During meiosis I, resulting in two haploid cells with replicated chromosomes.

Question 3

Which of the following mechanisms is NOT a contributor to genetic variation in sexually reproducing organisms?

Accepted Answer

Replication of DNA during mitosis

Question 4

If an African clawed frog has 36 chromosomes in its somatic cells, what is its haploid number?

Accepted Answer

$$n = 18$$

Question 5

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

Accepted Answer

Formation of tetrads and crossing over

Question 6

A human zygote is formed by the fusion of two gametes. How many possible diploid combinations can result from independent assortment and random fertilization?

Accepted Answer

$$70$$ trillion

Question 7

Which of the following best explains the evolutionary significance of genetic variation within populations?

Accepted Answer

It allows populations to accumulate genetic variations favored by the environment through natural selection.

Question 8

Which term refers to the specific location of a gene on a chromosome?

Accepted Answer

Locus

Question 9

What is the primary function of proteins in relation to gene expression?

Accepted Answer

Proteins are usually the end product of gene expression and produce phenotypes.

Question 10

Which of the following is true about homologous chromosomes?

Accepted Answer

They carry genes controlling the same inherited characters at the same loci.

Question 11

In the process of crossing over, what is exchanged between nonsister chromatids?

Accepted Answer

DNA segments

Question 12

Which equation correctly represents the diploid number of chromosomes in humans?

Accepted Answer

$$2n = 46$$

Question 13

Which of the following is a direct result of independent assortment during meiosis?

Accepted Answer

Each gamete receives a random combination of maternal and paternal chromosomes.

Question 14

Which process is responsible for producing gametes in humans?

Accepted Answer

Meiosis

Question 15

What is the significance of chiasmata during meiosis?

Accepted Answer

They are X-shaped regions where crossing over occurs, increasing genetic variation.

Question 16

Which of the following best describes the genetic code?

Accepted Answer

It consists of triplet nucleotides in mRNA that encode specific amino acids.

Question 17

Which of the following is NOT a characteristic of sexual reproduction?

Accepted Answer

It produces genetically identical offspring.

Question 18

Which of the following is true regarding autosomes in humans?

Accepted Answer

There are 22 pairs of autosomes in human cells.

Question 19

Which process results in four haploid daughter cells, each with half the number of chromosomes as the parent cell?

Accepted Answer

Meiosis

Question 20

Which of the following best explains why sexual reproduction is common in multicellular organisms?

Accepted Answer

It increases genetic diversity, which enhances adaptability to changing environments.

Principles of Genetics: Meiosis, Inheritance, and Genetic Variation

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