12th class (Fsc) Biology unit 7 MCQs
51. Each bivalent consists of four:
a. Chiasmata
b. Chromosomes
c. Spores
d. Chromatids
52. Meiosis-II is just like the:
a. Regeneration
b. Amitosis
c. Replacement
d. Mitosis
53. The condensation of chromosomes reaches to its maximum during:
a. Zygotene
b. Diakinesis
c. Leptotene
d. Pachytene
54. The interphase of meiosis lacks the stage:
a. G2
b. G0
c. D
d. G1
55. The condensation of chromosomes reaches to the maximum during:
a. Diakinesis
b. Pachytene
c. Leptotene
d. Zygotene
56. What are significant happening of meiosis?
a. Linkage
b. Crossing over
c. Crossing over and random assortment of chromosomes
d Random assortment of chromosomes
57. Pairing of homologous chromosomes for tetrad formation starts at:
a. Pachytene
b. Zygotene
c. Diplotene
d. Leptotene
58. The pairing of homologous chromosomes occurs during:
a. Pachytene
b. Leptotene
c. Diplotene
d. Zygotene
59. The stage of prophase that last for days, week or even year is:
a. Pachytene
b. Leptotene
c. Diplotene
d. Zygotene
60. The phase in Meiosis 1 which last for days, weeks or even years is:
a. Pachytene
b. Leptotene
c. Diplotene
d. Zygotene
61. Crossing over occurs during:
a. Zygotene
b. Diplotene
c. Leptotene
d. Pachytene
62. In klinefelter’s syndrome:
a. Sex chromosomes fail to segregate
b. One x chromosome is missing
c. Additional sex chromosome is present
d. None of them
63. The frequency of occurrence of down syndrome is:
a. 1/500
b. 1/700
c. 1/200
d. 1/40
64. The sex chromosomes of the person affected with klinefelter’s syndrome are:
a. XXY
b. XYY
c. XY
d. XXX
65. The autosomal non-disjunction in man in which 21st pair of chromosome fail to segregate resulting in gametes with 24 chromosome is:
a. Klinfliter syndrome
b. Down’s syndrome
c. Jacob’s syndrome
d. Turner’s syndrome
66. Unequal separation of chromosomes is called:
a. Nondisjunction
b. Disjunction
c. Metastasis
d. Separation
67. The syndrome in which individual has short stature, webbed neck without ovaries and complete absence of germ cells is:
a. Down’s syndrome
b. Mongolism
c. Turner’s syndrome
d. Kline felter syndrome
68. All are related to turner’s syndrome except:
a. Broad face
b. Short stature
c. Without ovaries
d. Webbed neck
69. In non disjunction, chromosomes fail to seqraqate during:
a. Anaphase
b. Prophase
c. Telophase
d. Metaphase
70. Cell death due to tissue damage is called:
a. Necrosis
b. Apoptosis
c. Suicide
d. Metastasis
71. Programmed and organized process of cell death is also called as:
a. Cancer
b. Apoptosis
c. Metastasis
d. Necrosis
72. Apoptosis is:
a. Suicide of cells
b. Division of cells
c. Weakness of cells
d. Death of cells by tissue damage
73. The death of the cell due to tissue damage is called:
a. Metastasis
b. Necrosis
c. Apoptosis
d. Phagocytosis
74. Programmed and organized death of cell is known as:
a. Cyclosis
b. Necrosis
c. Chlorosis
d. Apoptosis
Click here to go directly on chapter no.8