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Biology - Questions and Answers from Previous Year Exam Papers

81 The human chromosomes are divided into 7 groups. B-chromosomes are
A 6-12
B 1-2
C 13-15
D 4-5

Answer: Option [D]

The human chromosomes are divided into 7 groups. B-chromosomes are 4-5. Group B chromosomes include chromosomes 4 and 5. These are large and are submetacentric.

82 The condensation of the chromosomes are maximal with visible centromeres at which phase of cell cycle
A G1 phase
B S phase
C G2 phase
D M phase

Answer: Option [D]

The correct answer is M phase. In metaphase, the maximum condensation of chromosomes is observed and they are arranged in a row near the equatorial position.

83 Gene can be defined as
A unit of segregation
B unit of physiological activity
C unit of recombination
D unit of function

Answer: Option [C]

Gene can be defined as unit of recombination.

84 Lamp-brush chromosome is found in
A drosophila
B ascaris
C hydra
D none of the above

Answer: Option [D]

Lampbrush chromosomes are a special form of chromosome found in the growing oocytes (immature eggs) of most animals, except mammals. It is most prominently seen in the diplotene stage of prophase I of meiosis.

85 In recent past human chromosomes have been studied by technique using specific oftenfluorescent dyes, known as
A dyeing technique
B banding technique
C ultra dyeing technique
D karyotyping technique

Answer: Option [B]

The correct answer is banding technique. In metaphase, chromosomes can be identified using certain staining techniques, so called banding. Cells are cultured and then stopped in metaphase to maximize the number of suitable cells. They are then spread on a slide, stained with a suitable dye and visualized in the microscope.

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