RIO BIO 156 EXAM 2 ACTUAL EXAM 250 QUESTIONS

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RIO BIO 156 EXAM 2 ACTUAL EXAM 250

QUESTIONS AND CORRECT DETAILED

ANSWERS ALREADY GRADED

1. Solve this monohybrid genetics problem: Black hair is governed by the

dominant gene (B) and blond hair is determined by the recessive gene (b). In this monohybrid cross, if both parents are heterozygous, what percentage of the offspring would be expected to have blond hair?

A) 75%

B) 50%

C) 100%

D) 25%

E) 33.3%

Correct Answer: D) 25%

• A pair of chromosomes that are similar in length, shape, and the traits they

govern are called ___.

• diploid chromosomes
• mitotic chromosomes
• homologous chromosomes
• germ chromosomes
• homozygous chromosomes

Correct Answer: C) homologous chromosomes

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3. A monohybrid cross is:

• the second generation of a self-fertilization plant.
• a breeding experiment in which the parental varieties have only one trait in

common.

• a breeding experiment in which the parental varieties differ only in one trait.
• a triploid plant that results from breeding two very different plants.
• None of the choices are correct.

Correct Answer: C) a breeding experiment in which the parental varieties differ

only in one trait.

• In multicellular organisms, mitosis is ___.
• the means of tissue growth and repair.
• a way of generating new kinds of mutant or recombinant organisms.
• the means of sexual reproduction.
• not useful in stem cell lines that constantly replace skin, etc.
• able to occur in only a few cells of specialized tissues.

Correct Answer: A) the means of tissue growth and repair.

• Which sequence of stages in mitosis is correct?
• prophase, anaphase, metaphase, telophase
• prophase, telophase, anaphase, metaphase
• prophase, metaphase, anaphase, telophase
• telophase, anaphase, prophase, metaphase
• anaphase, metaphase, prophase, telophase

Correct Answer: C) prophase, metaphase, anaphase, telophase

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• What is the importance of crossing-over?
• It provides extra genetic material for the daughter cells.
• It increases the likelihood that daughter cells contain different genetic

material.

• It produces the proteins that are associated with DNA in chromosomes.
• It increases chromosomes condensation.
• It separates the homologous chromosomes.

Correct Answer: B) It increases the likelihood that daughter cells contain

different genetic material.

7. Different alleles of the same gene are found:

• at the same place on mitochondrial chromosomes.
• at different places on homologous chromosomes.
• at the same place on homologous chromosomes.
• throughout the chromosomes at different places.
• in different individuals on different chromosomes.

Correct Answer: C) at the same place on homologous chromosomes.

• Which occurs in metaphase?
• Centrioles move to opposite poles.
• Chromosomes line up along the equator of the dividing cell.
• Chromosomes move to opposite poles.
• The nuclear envelope disappears.
• The nuclear envelope forms.

Correct Answer: B) Chromosomes line up along the equator of the dividing cell.

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• If a parental cell has 12 chromosomes, then each of the daughter cells

following meiosis will have ___.

• 48 chromosomes
• 24 chromosomes
• 12 chromosomes
• 6 chromosomes
• 4 chromosomes

Correct Answer: D) 6 chromosomes

• Division by mitosis produces two cellular descendants, each with half the

chromosome number of the parent.

• True
• False

Correct Answer: B) False (Each descendant has the same number of

chromosomes as the parent).

• Sister chromatids are identical.
• True
• False

Correct Answer: A) True

• Which of the following body processes requires mitosis?
• Sexual reproduction
• Metabolism
• Wound repair
• Protein synthesis

Correct Answer: C) Wound repair