Question 1

Which of the following best describes the role of mitosis in multicellular organisms?

Accepted Answer

It is responsible for the repair of damaged tissues and growth by producing genetically identical cells.

Question 2

During which phase of the cell cycle does DNA replication occur, and what is the significance of this process?

Accepted Answer

DNA replication occurs during the S phase, ensuring each daughter cell receives an identical set of chromosomes.

Question 3

A cell with a diploid number of 8 ($$2n = 8) $$undergoes meiosis. How many chromosomes will each resulting gamete contain, and why is this reduction important?

Accepted Answer

Each gamete will contain 4 chromosomes; this reduction prevents chromosome doubling during fertilization.

Question 4

Which event during meiosis increases genetic variation among offspring?

Accepted Answer

Crossing over between homologous chromosomes during prophase I

Question 5

A geneticist observes a pedigree where a trait appears in every generation and affects both males and females equally. Which inheritance pattern is most likely?

Accepted Answer

Autosomal dominant

Question 6

Which of the following best explains Mendel’s Law of Independent Assortment?

Accepted Answer

Alleles for different genes assort independently of one another during gamete formation.

Question 7

A woman who is a carrier for a sex-linked recessive disorder (X$$^NX$^n) $$and a man who is unaffected (X$$^NY) $$have a child. What is the probability that their son will have the disorder?

Accepted Answer

$$50\%$$

Question 8

Which of the following scenarios describes nondisjunction, and what is a possible outcome?

Accepted Answer

Homologous chromosomes fail to separate during meiosis I, resulting in gametes with an abnormal number of chromosomes, such as trisomy 21.

Question 9

Which process ensures that each new DNA molecule contains one old strand and one new strand?

Accepted Answer

Semi-conservative replication

Question 10

If a DNA template strand has the sequence $$5'	ext{-}ATGCCGTA-3'$$, what is the sequence of the complementary RNA strand produced during transcription?

Accepted Answer

$$5'	ext{-}UACGGCAU-3'$$

Question 11

Which of the following best describes the difference between autosomal recessive and autosomal dominant inheritance?

Accepted Answer

Autosomal dominant traits appear in every generation, while autosomal recessive traits may skip generations.

Question 12

Which of the following is a result of crossing over during meiosis?

Accepted Answer

Exchange of genetic material between homologous chromosomes, increasing genetic diversity

Question 13

A man with blood type AB and a woman with blood type O have children. Which blood types are possible for their offspring?

Accepted Answer

A and B

Question 14

Which of the following best explains why linked genes do not always show complete linkage?

Accepted Answer

Crossing over during meiosis can separate linked genes, resulting in recombinant phenotypes.

Question 15

Which of the following mutations is most likely to result in a nonfunctional protein?

Accepted Answer

A nonsense mutation

Question 16

Which process occurs during translation in protein synthesis?

Accepted Answer

mRNA is decoded by ribosomes to assemble amino acids into a polypeptide chain.

Question 17

A woman is heterozygous for a gene with incomplete dominance (Rr), and a man is homozygous recessive (rr). What is the expected phenotypic ratio of their offspring?

Accepted Answer

1:1 (one intermediate: one recessive)

Question 18

Which of the following best describes the function of tRNA during translation?

Accepted Answer

tRNA carries amino acids to the ribosome and matches them to the coded mRNA message.

Question 19

Which of the following best explains how environmental factors can influence phenotype?

Accepted Answer

Environmental factors can alter gene expression, resulting in different phenotypes from the same genotype.

Question 20

Which of the following is true regarding the separation of sister chromatids?

Accepted Answer

Sister chromatids separate during anaphase II of meiosis and anaphase of mitosis.

BIO 101 Chapters 8-10 Study Guide: Cellular Reproduction, Patterns of Inheritance, and Molecular Biology of the Gene

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