12th Biology Question Bank. We covered all the 12th Biology Question Bank MCQs in this post for free so that you can practice well for the exam.
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12th Biology Objective Question Bank for Students
For a colorblind person, the red color appears as
(a) yellow
(b) blue
(c) green
(d) violet
Option c – green
Barr body is absent in somatic cells of
(a) Klinefelter syndrome individual.
(b) Triple X syndrome individual.
(c) Turner syndrome individual.
(d) Sub-human mammalian female individual.
Option c – Turner syndrome individual
Which of the following is an X-linked genetic disease?
(a) Becker’s muscular dystrophy
(b) Daltonism Color Blindness
(c) Martin-Bell syndrome
(d) All of the above
Option d – All of the above
Down’s syndrome is due to
(a) chromosome number increase in the 21st pair autosome.
(b) chromosome number decreases in the 21st pair autosome.
(c) chromosome number increases in the 18th pair autosome.
(d) chromosome number decreases in the 18th pair autosome.
Option a – chromosome number increase in the 21st pair autosome
Gynandromorph is
(a) male with female traits.
(b) female with male traits.
(c) half male and half female.
(d) None of the above
Option c – half male and half female
Which one of the following is not a genetic disorder?
(a) Color blindness
(b) Down’s syndrome
(c) Hemophilia
(d) Xerophthalmia
Option d – Xerophthalmia
Which one among the following is not correct about Down’s syndrome?
(a) It is a genetic disorder.
(b) Affected individual has early aging.
(c) Effected person has mental retardation.
(d) The affected person has a furrowed tongue.
Option b – Affected individual has early aging
The gene for color blindness is located on
(a) Y-chromosome
(b) 13th chromosome
(c) X-chromosome
(d) 21st chromosome
Option c – X-chromosome
Hemophilia is a genetic disorder that leads to
(a) a decrease in hemoglobin levels.
(b) rheumatic heart disease.
(c) decrease in WBC.
(d) prevent the clotting of blood.
Option d – prevent the clotting of blood
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