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Question (31)

QN0036202

31 Which F2 combination represents a new combination compared with tall-round and short-wrinkled parental combinations?

(A) Tall and wrinkled
(B) Tall and round only
(C) Short and wrinkled only
(D) Neither tall nor short

Correct Answer: A

Explanation:

Tall-wrinkled and short-round are new combinations formed in the F2 generation.

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Question (32)

QN0036203

32 What is a gene?

(A) A section of DNA that provides information for one protein
(B) A complete organism
(C) A type of cell membrane
(D) A digestive enzyme

Correct Answer: A

Explanation:

A gene is a section of DNA providing information for one protein.

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Question (33)

QN0036204

33 What is the role of DNA in relation to proteins?

(A) DNA provides information for making proteins
(B) DNA destroys all proteins
(C) DNA prevents cell division
(D) DNA acts only as food

Correct Answer: A

Explanation:

Cellular DNA is the information source for making proteins.

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Question (34)

QN0036205

34 A gene controls plant height by controlling the production of an enzyme involved in making a plant hormone. If the enzyme works efficiently, what is expected?

(A) Less hormone and shorter plant
(B) More hormone and taller plant
(C) No hormone and no growth
(D) No change in height

Correct Answer: B

Explanation:

An efficient enzyme leads to more hormone production, which can result in a taller plant.

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Question (35)

QN0036206

35 If a gene alteration makes an enzyme less efficient in producing a growth-related hormone, the plant is likely to be

(A) taller
(B) shorter
(C) identical in height
(D) unable to form DNA

Correct Answer: B

Explanation:

A less efficient enzyme results in less hormone and can lead to shorter growth.

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Question (36)

QN0036207

36 During sexual reproduction, each parent contributes a copy of the same gene because

(A) both parents contribute genetic material
(B) only one parent contributes DNA
(C) genes are not inherited
(D) chromosomes are absent

Correct Answer: A

Explanation:

Both parents contribute genetic material, so the offspring receives gene copies from each.

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Question (37)

QN0036208

37 How many sets of genes does a normal body cell of a pea plant have according to the chapter?

(A) One
(B) Two
(C) Three
(D) Four

Correct Answer: B

Explanation:

Each body cell has two sets of genes, one inherited from each parent.

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Question (38)

QN0036209

38 Why must germ cells have only one gene set?

(A) So that the normal chromosome number can be restored when two germ cells combine
(B) So that no DNA is inherited
(C) So that only the mother contributes genes
(D) So that all offspring are identical

Correct Answer: A

Explanation:

Each germ cell carries one set, and fusion of two germ cells restores the normal number.

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Question (39)

QN0036210

39 Each chromosome in a body cell is present as

(A) only one copy
(B) two copies, one from each parent
(C) three copies from the mother
(D) four copies from the father

Correct Answer: B

Explanation:

Each chromosome pair contains one chromosome inherited from the male parent and one from the female parent.

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Question (40)

QN0036211

40 What happens to chromosomes during the formation of germ cells?

(A) A germ cell receives one chromosome from each pair
(B) A germ cell receives all chromosomes from both parents
(C) Chromosomes disappear completely
(D) Chromosomes become proteins

Correct Answer: A

Explanation:

Each germ cell receives one chromosome from each pair.

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Question (31)

31 Which F2 combination represents a new combination compared with tall-round and short-wrinkled parental combinations?

Explanation:

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Question (32)

32 What is a gene?

Explanation:

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Question (33)

33 What is the role of DNA in relation to proteins?

Explanation:

Link:

Question (34)

34 A gene controls plant height by controlling the production of an enzyme involved in making a plant hormone. If the enzyme works efficiently, what is expected?

Explanation:

Link:

Question (35)

35 If a gene alteration makes an enzyme less efficient in producing a growth-related hormone, the plant is likely to be

Explanation:

Link:

Question (36)

36 During sexual reproduction, each parent contributes a copy of the same gene because

Explanation:

Link:

Question (37)

37 How many sets of genes does a normal body cell of a pea plant have according to the chapter?

Explanation:

Link:

Question (38)

38 Why must germ cells have only one gene set?

Explanation:

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Question (39)

39 Each chromosome in a body cell is present as

Explanation:

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Question (40)

40 What happens to chromosomes during the formation of germ cells?

Explanation:

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