Table of Contents
MCQs OF BIOLOGY CLASS 12
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1. Mendel was lucky in choosing pea plant for his experiment for explaining the laws of inheritance because ……….
(a) Pea plants belong to the family leguminosae
(b) They show red coloured flowers
(c) They have round seeds which have large amount of proteins
(d) The seven characters he selected were on four different chromosome
2. Which of the following form represents a pair of contrasting characters?
(a) Alleles
(b) Phenotype
(c) Homozygous
(d) Heterozygous
3. A cross between a heterozygous and a homozygous recessive individual gives a ratio of …….
(a) 2 : 1
(b) 3 : 1
(c) I : 2 : I
(d) 1 :1
4. Inheritance of colour of kernel in wheat is an example of ……
(a) Monogenic inheritance
(b) Polygenic inheritance
(c) Pleiotropic inheritance
(d) None of the above
5. Which of the following is dangerous?
(a) Rh + ve father and Rh -ve mother
(b) Rh -ve father and Rh +ve mother
(c) Rh -ve father and Rh -ve mother
(d) Rh +ve father and Rh +ve mother
6. In crossing self fertilized crops the flowers are first emasculated. Which organs of the plants are removed in this process?
(a) Stigma
(b) Anthers
(c) Ovules
(d) Sepals
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7. If two alleles come together , one of the two finds morphological expression, masking other in the body of the organism, this fact is described as ……..
(a) Law of inheritance
(b) Law of dominance
(c) Law of limiting factor
(d) Law of segregation
8. A couple with blood types A and B may have children with which of the blood types ………….
(a) A and B only
(b) A. B and AB
(c) A. B, AB and 0
(d) AB only
9. If a plant heterozygous for tallness is selfed, the F2 generation has both tall and dwarf plants. This proves the principle of ………
(a) Dominance
(b) Segregation
(c) Independent assortment
(d) Incomplete dominance
10. If hybrid red flowered plants of pea are crossed back to pure red flowered parent, the progeny will show ……..
(a) All red flowered plants
(b) All white flowered plants
(c) 50% red and 50% white flowered plants
(d) 3 red: 1 white flowered plant
11. Segregation and independent assortment of genetic material occur during ………….
(a) Mitosis
(b) Meiosis
(c) Meiosis II
(d) All of these
12. Which of the following is heterozygous for two pairs of alleles?
(a) TTRR
(b) TtRR
(c) Ttrr
(d) TtRr
ANSWERS:
| 1.d 2.a 3.d 4.b 5.a 6.b | 7.b 8.c 9.b 10.c 11.b 12.d |
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