Biology MCQs For WBCS Exam
WBCS BIOLOGY MCQ Q1.
If a couple has three daughters, what are the chances that the fourth child will be a son?
(a) 100%
(b) 75%
(c) 50%
(d) 0%
Ans. (c)
WBCS BIOLOGY MCQ Q2.
If a dihybrid pea plant heterozygous for flower colour (red dominant over white) and seed shape
(round dominant over wrinkled) under goes selfing, the types of gametes produced are:
(a) 2
(b) 4
(c) 8
(d) 16
Ans. (b)
WBCS BIOLOGY MCQ Q3.
The crossing of a homozygous tall plant with a dwarf would yield plaits in the ratio of
(a) two tall and two dwarf
(b) one homozygous tall, one homozygous dwarf and two heterozygous tall
(c) all homozygous dwarf
(d) all homozygous tall
Ans. (b)
WBCS BIOLOGY MCQ Q4.
Blue eye colour in human is recessive to brown eye colour. The expected children of a marriage
between blue-eyed woman and brown-eyed male who had a blue-eyed mother are likely to be
(a) all blue-eyed
(b) three blue-eyed and one brown-eyed
(c) all brown-eyed
(d) one blue-eyed and one brown-eyed
Ans. (d)
WBCS BIOLOGY MCQ Q5.
The genotype of a dominant parent is determined by crossing it with the recessive parent. This
cross is called
(a) back cross
(b) test cross
(c) long cross
(d) out cross
Ans. (b)
WBCS BIOLOGY MCQ Q6.
Chromosome theory of heredity was postulated by
(a) Charles Darwin
(b) Gregor Mendel
(c) Sutton and Boveri
(d) Har Gobind Khorana
Ans. (c)
WBCS BIOLOGY MCQ Q7.
Continuity of germplasm theory by WEISMANN was proposed in
(a) 1838
(b) 1883
(c) 1865
(d) 1859
Ans. (b)
WBCS BIOLOGY MCQ Q8.
Allosomes are
(a) bead like structure on chromosomes
(b) sex chromosomes
(c) rounded bodies
(d) node like structure on chromosomes
Ans. (b)
WBCS BIOLOGY MCQ Q9.
Mutation is
(a) a change that is inherited
(b) a change, which affects the parents only but never inherited
(c) a change, which affects the offspring of F2 generation only
(d) a factor responsible for plant growth
Ans. (a)
WBCS BIOLOGY MCQ Q10.
Recessive mutation are expressed normally
(a) has to express always since it is a mutation
(b) in heterozygous condition
(c) neither in homozygous nor in heterozygous condition
(d) in homozygous condition
Ans. (d)
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