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Question (41)

QN0036212

41 When two germ cells combine during sexual reproduction, they

(A) reduce the chromosome number further
(B) restore the normal chromosome number
(C) remove all genes
(D) produce only maternal chromosomes

Correct Answer: B

Explanation:

Combining two germ cells restores the normal chromosome number in the offspring.

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Question (42)

QN0036213

42 Which statement correctly describes human sex chromosomes in females?

(A) XY
(B) XX
(C) YY
(D) XYY

Correct Answer: B

Explanation:

Human females have two X sex chromosomes, represented as XX.

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Question (43)

QN0036214

43 Which statement correctly describes human sex chromosomes in males?

(A) XX
(B) XY
(C) YY
(D) XXX

Correct Answer: B

Explanation:

Human males have one X and one Y chromosome.

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Question (44)

QN0036215

44 How many pairs of chromosomes in humans are described as ordinary paired chromosomes in the chapter?

(A) 20
(B) 21
(C) 22
(D) 23

Correct Answer: C

Explanation:

Humans have 22 such chromosome pairs, while the remaining pair is the sex chromosome pair.

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Question (45)

QN0036216

45 Which chromosome does every child inherit from the mother according to the chapter?

(A) X chromosome
(B) Y chromosome
(C) Both X and Y
(D) Neither X nor Y

Correct Answer: A

Explanation:

The mother has XX chromosomes and therefore passes an X chromosome to every child.

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Question (46)

QN0036217

46 Which parent determines whether a human child receives an X or Y sex chromosome?

(A) Mother
(B) Father
(C) Both always provide Y
(D) Neither parent

Correct Answer: B

Explanation:

The father can contribute either X or Y, while the mother contributes X.

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Question (47)

QN0036218

47 A child inherits an X chromosome from the mother and an X chromosome from the father. According to the chapter, the child will be

(A) a boy
(B) a girl
(C) unable to develop
(D) genetically identical to the father

Correct Answer: B

Explanation:

XX represents a female in humans.

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Question (48)

QN0036219

48 A child inherits an X chromosome from the mother and a Y chromosome from the father. According to the chapter, the child will be

(A) a girl
(B) a boy
(C) unable to develop
(D) XX

Correct Answer: B

Explanation:

XY represents a male in humans.

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Question (49)

QN0036220

49 Why can approximately half the children be boys and half girls according to the chromosome mechanism described?

(A) The father can contribute either X or Y chromosome
(B) The mother can contribute either X or Y chromosome
(C) Both parents always contribute Y
(D) The environment always determines sex

Correct Answer: A

Explanation:

The father produces germ cells carrying either X or Y, while the mother always contributes X.

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Question (50)

QN0036221

50 Which statement best summarises the role of variation and heredity in evolution?

(A) All variations have equal survival value
(B) Variations can be inherited and some may provide survival advantages
(C) Variations never pass to offspring
(D) Only acquired traits are inherited

Correct Answer: B

Explanation:

Inherited variations may provide advantages in particular environments and contribute to survival.

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Question (41)

41 When two germ cells combine during sexual reproduction, they

Explanation:

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Question (42)

42 Which statement correctly describes human sex chromosomes in females?

Explanation:

Link:

Question (43)

43 Which statement correctly describes human sex chromosomes in males?

Explanation:

Link:

Question (44)

44 How many pairs of chromosomes in humans are described as ordinary paired chromosomes in the chapter?

Explanation:

Link:

Question (45)

45 Which chromosome does every child inherit from the mother according to the chapter?

Explanation:

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Question (46)

46 Which parent determines whether a human child receives an X or Y sex chromosome?

Explanation:

Link:

Question (47)

47 A child inherits an X chromosome from the mother and an X chromosome from the father. According to the chapter, the child will be

Explanation:

Link:

Question (48)

48 A child inherits an X chromosome from the mother and a Y chromosome from the father. According to the chapter, the child will be

Explanation:

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Question (49)

49 Why can approximately half the children be boys and half girls according to the chromosome mechanism described?

Explanation:

Link:

Question (50)

50 Which statement best summarises the role of variation and heredity in evolution?

Explanation:

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