Dr. AASHISH H. PANCHAL (M.Pharm., Ph.D.)
TRISHA INSTITUTE OF BIOLOGY
GSEB/CBSE/ISC/NEET
COMPLETE BIOLOGY SOLUTION
STD-12 (Semester-4)
Sub: Biology (056) (E)
CHAPTER-8 Principal of Inheritance and Variation
Time: 15 Min.
PART-A
Marks:14
Note: (1) In this section total 50 questions, each carry 1 mark (2) All questions are compulsory
1. A human male produces sperms with the genotypes AB, Ab, aB and ab pertaining to two diallelic characters
in equal proportions. What is the corresponding genotype of this person?
(a) AaBb
(b) AaBB
(c)
AABb (d)
AABB
2. Inheritance of skin colour in humans is an example of
(a)chromosomal aberration
(b)point mutation
(c)polygenic inheritance
(d)codominance
3. Two genes R and Y are located very close on the chromosomal linkage map of maize plant. When RRYY and
rryy genotypes are hybridized, then F2 segregation will show.
(a)higher number of the recombinant types
(b)segregation in the expected 9 : 3 : 3 : 1 ratio
(c)segregation in 3 : 1 ratio
(d)higher number of the parental types
4. A child of blood group ‘O’ can not have parents of blood groups
(a)O and O
(b)A and B
(c)B and AB
(d)AB and AB/O
5. Test cross involves
(a)crossing between two genotypes with recessive trait
(b)recessive trait crossing between two F1 hybrids
(c)crossing the F2, hybrid with a double recessive genotype (d)crossing between two genotypes with dominant trait
6. In 1900 A.D. three biologists independently rediscovered Mendel's principles. They are
(a) De Vries, Correns and Tschermak
(b)
Sutton, Morgan and Bridges
(c) Avery, McLeod and McCarthy
(d)
Bateson, Punnet and Bridges
7. Mendel chose pea plants because
(a) They were cheap
(b)They were having seven pairs of contrasting characters
(c) They were easily available
(d)Of great economic importance
8. An allele is said to be dominant if
(a) It is expressed only in heterozygous combination (b)
It is expressed only in homozygous combination
(c) It is expressed in both homozygous and heterozygous condition(d) It is expressed only in second generation
9. What type of gametes will form by genotype RrYy
(a) RY, Ry, rY, ry
(b) RY, Ry, ry, ry
(c)
Ry, Ry, Yy, ry
(d)
Rr, RR, Yy, YY
10. If two opposite alleles come together, one finding morphological expression masking the other, the fact is
described as law of
(a) Inheritance
(b) Dominance
(c)
Limiting factor (d)
Segregation
11. In hybridization, Tt × tt give rise to the progeny of ratio
(a) 1 : 1
(b) 1 : 2
(c)
2:1
(d)
1 : 2: 1
12. If in a garden pea plant, a cross is made between red flowered and white flowered plants. What will be the
phenotypic ratio in F2 generation except co dominancy and incomplete dominancy
(a) 1 : 2 : 1
(b) 9 : 3 : 3 : 1
(c)
3:1
(d)
1:3
13. The crossing of a homozygous tall plant with a dwarf in F2 would yield plants in the ratio of
(a) All homozygous dwarf
(b)
All heterozygous tall
(c) One homozygous tall, one homozygous dwarf and two heterozygous tall
(d)
Two tall and two dwarf
14. In Mirabilis jalapa, when homozygous red-flowered and white-flowered plants are crossed, all F1 plants
have pink-coloured flowers. In F2 produced by selfing of F1 individuals, red, pink and white flowered plants
appear respectively in the ratio of or What will be the ratio in F2 generation if red-flowered variety of Mirabilis
jalapa is crossed with white-flowered variety
(a) 1 : 1 : 1 : 1
(b) 1 : 2 : 1
(c)
2:1
(d)
3:1
15. The percentage of crossing over will be more if
(a) Linked genes are located far apart from each other (b)
Linked genes are located close to each other
(c) Genes are not linked
(d)
Genes are located in a different cell
SECTION-A
Each question carry 2 Marks
8
1. What is pleiotropy? Give one example.
3. explain the independent assortment
2. Why mendel select the pea plant.
4. explain the polygenic inheritance for skin color
SECTION-B
Each question carry 3 Marks
09
5. Explain the chromosomal theory of inheritance.
7. Explain blood group with their genotype.
6. explain the co-dominancy or incomplete dominancy
SECTION-C
Each question carry 4 Marks
08
8. Explain Mendel's monohybrid experiments with the law of segregation and dominance with cross test.
9. Write a note on linkage and recombination.
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