Question 1

Which of the following best describes a somatic mutation?

Accepted Answer

A mutation that occurs in non-reproductive cells and is not passed to offspring.

Question 2

In animals, a mutation in a germ-line cell can be transmitted to offspring. Which process allows this transmission?

Accepted Answer

Sexual reproduction

Question 3

Why does the somatic/germline distinction not strictly apply to plant cells?

Accepted Answer

Many plant cells can become gametes, so somatic cells may give rise to reproductive cells.

Question 4

A mutation occurs in a fish's somatic tissue. What is the most likely outcome?

Accepted Answer

The mutation will affect only the fish and not its offspring.

Question 5

Which of the following equations correctly represents the probability $$P$$ that a mutation in a germ-line cell will be inherited by offspring, assuming random mating and equal gamete contribution?

Accepted Answer

$$P = \frac{1}{2}$$

Question 6

If a mutation occurs on an autosome, which of the following is true?

Accepted Answer

It can affect both males and females equally.

Question 7

Which statement correctly distinguishes between autosomes and sex chromosomes?

Accepted Answer

Autosomes are chromosomes that do not determine sex, while sex chromosomes are involved in sex determination.

Question 8

A mutation in a sex chromosome can lead to which of the following outcomes?

Accepted Answer

Sex-linked genetic disorders

Question 9

Which of the following best explains why a mutation in a plant leaf cell could potentially be inherited by the next generation?

Accepted Answer

Plant cells can dedifferentiate and become gametes, allowing mutations in somatic cells to be passed on.

Question 10

Which of the following scenarios would result in all cells of an organism carrying a mutation?

Accepted Answer

A mutation occurs in the zygote before the first cell division.

Question 11

If a mutation occurs in a germ-line cell and is present in the gamete, what is the probability that it will be present in the offspring after fertilization?

Accepted Answer

$$P = 1$$

Question 12

Which of the following is NOT a correct distinction between somatic and germ-line mutations?

Accepted Answer

Somatic mutations are inherited by offspring.

Question 13

A geneticist discovers a mutation in the X chromosome of a male patient. Which of the following is a possible consequence?

Accepted Answer

The mutation may cause an X-linked disorder that is expressed in the male.

Question 14

Which equation represents the total number of autosomes in a human somatic cell?

Accepted Answer

$$N = 2 	imes 22 = 44$$

Question 15

A mutation occurs in a cell that will become a pollen grain in a flowering plant. What is the best classification for this mutation?

Accepted Answer

Germ-line mutation

Question 16

Which of the following statements is TRUE regarding the inheritance of mutations in sex chromosomes?

Accepted Answer

Mutations in sex chromosomes can be inherited and may show sex-linked patterns of inheritance.

Question 17

If a mutation occurs in a somatic cell after fertilization, what is the probability that it will be present in the gametes produced by the organism?

Accepted Answer

$$P = 0$$

Question 18

Which of the following best describes the difference between autosome and sex chromosome mutations?

Accepted Answer

Autosome mutations affect traits not related to sex determination, while sex chromosome mutations can affect sex-linked traits.

Question 19

A mutation in a plant root cell leads to a new flower color in the next generation. What does this suggest about the cell lineage in plants?

Accepted Answer

Somatic cells in plants can give rise to gametes, allowing somatic mutations to be inherited.

Question 20

Which of the following is a correct statement about the terms 'autosome' and 'somatic cell'?

Accepted Answer

Autosome refers to a chromosome type, while somatic cell refers to a cell type.

Classification of Mutations: Cell Type and Chromosome Type

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