Biology APPSC Previous Question Papers

1) Read the following statements regarding Mendelian inheritance and choose the correct option
1) Mendels experiments had small sample sample size which gave greater credibility to the data
2) A true breeding line shows a stable trait inheritance and expression for several generations
3) In a dissimilar pair of factors, one member of the pair dominates over the other
4) A recessive parental trait is expressed only in its heterozygous condition
5) Two alleles of a gene are located on homologous sites on homologous chromosomes
A) 2 alone is correct
B) 2,3& 5 are correct
C) 1 & 4 are correct
D) 1,3 & 5 are correct

2) Which of the following is not a correct dominant recessive trait pairs of Pisum sativum?
A) Axial- terminal flower position, Tall-dwarf stem height
B) Yellow- green pod colour, roundwrinkled seed shape
C) Full- constricted pod shape, Yellow-green seed colour
D) Violet- white flower colour , Inflated Constricted pod shape

3) The term genetics was proposed by 
A) Johannsen
B) Morgan
C) Mendel
D) Bateson

4) Branch of biology dealing with heredity and variations is
A) Ecology
B) Evolution
C) Paleontology
D) Genetics

5) Phenotype of an organism is the result of
A) Mutations and linkages
B) Genotype and environment interactions
C) Cytoplasmic effect and nutrition
D) Environmental changes and sexual dimorphism

6) Alleles are
A) Similar forms of different gene
B) Slightly different forms of the different gene
C) Similar forms of the same gene
D) Slightly different forms of the same gene

7) Select one word for the statement Dominance, co-dominance , incomplete dominance
a) If F1 resembled both the parents
b) If F1 did not resemble either of the two parents and was in between the two
c) If F1 resembled either of the two parents
A) c-dominance, b-co dominance, a- incomplete dominance
B) a-dominance, c-co dominance, b- incomplete dominance
C) b-dominance, a-co dominance, c- incomplete dominance
D) c-dominance, a-co dominance, b- incomplete dominance

8) Both the characters in a mono hybrid cross are recovered as such in the F 2 generation though one of these in not seen at the F 1 stage . This interpretation is based on the
A) First Law of Mendel
B) Second Law of Mendel
C) Second set of generalizations
D) Incomplete dominance

9) The proportion of 3:1 at the F2 generation is explained by the
A) Law of Dominance
B) Law of Segregation
C) Law of Independent assortment
D) Test cross

10) Which is correct ?
A) Each back cross is test cross
B) Each test cross is back cross
C) Crossing F2 with F1 is called test cross
D) Crossing F2 with either parent is called test cross

11) Mendel’s principle of segregation is based on separation of alleles during
A) Gamete formation
B) Seed formation
C) Pollination
D) Embryonic development

12) A pure tall Pea plant is crossed with pure dwarf Pea plant. The progeny is self-pollinated. The ratio of true breeding tall Pea plants to true breeding dwarf Pea plants shall be
A) 2 : 1
B) 1:1
C) 3 : 1
D) 1: 2

13) In Mendelian dihybrid cross the yellow and green colour of seed is segregated in the ratio of
A) 3:1
B) 10:6
C) 9:4
D) 9:7

14) Read the following statements 
i) Morgan carried out several mono hybrid crosses in Drosophila to study genes that were sex-linked
ii) Morgan attributed that proportion of parental gene combination is less than the non-parental type due to the physical association
iii) Term recombination was coined by Morgan to describe the generation of non-parental gene combinations
iv) Alfred Strutevent used the frequency of linkage between genepairs on the same chromosome and find genetic map. 
Select how many are incorrect statement
A) 3
B) 1
C) 4
D) 2

15) Drosophila melanogaster is found to be very suitable for genetic studies because
i) They could be grown in simple synthetic medium in the laboratory
ii) They complete their life-cycle in about 14 days
iii) A single mating could produce a large number of progenies
iv) Male and female are clearly distinguishable 
v) It has few hereditary variations that can be seen with high power microscopes 
Select how many are correct statement
A) 5
B) 4
C) 2
D) 3

16) Experimental verification of chromosomal theory of inheritance was given by
A) Thomas Hunt Morgan
B) Gregor Johann Mendel
C) Hungo de Vries
D) Langdon Down

17) Match the genetic Phenomena with their respective ratios
a) Inhibitory gene ratio                              1) 9 : 3: 4
b) Complementary gene ratio                   2) 1:1:1:1
c) Recessive epistasis ratio                        3) 12 :3:1
d) Dihybrid test cross ratio                       4) 13 : 3
e) Dominant epistasis ratio                        5) 9 : 7
A) a-5,b- 4,c-3,d- 2,e-1
B) a-4,b- 5,c-1,d- 2,e-3
C) a-1,b- 2,c-4,d- 3,e-5
D) a-2,b- 1,c-4,d- 5,e-3

18) A tall pea plant with round seeds (TTRR) is crossed with a dwarf wrinkle seeded plant (ttrr) . F1 has tall plants with rounded seeds. What is the proportion of dwarf plants with wrinkled seeds in F2 generation?
A) Zero
B)‰  %
C) … –
D) 1/16

19) In Mendel’s experiments withGarden Pea , round seed shape (RR) was dominant (YY) was dominant over green cotyledons (yy). What are expected phenotypes in F2 generation RRYY x rryy?
A) Only wrinkled seeds with green cotyledons
B) Only wrinkled seeds with yellow cotyledons
C) Only round seeds with green cotyledons
D) Round seeds with yellow cotyledons and wrinkled seeds with green cotyledons

20) Mendel’s law of segregation in applicable to
A) Dihybrid cross only
B) Both dihybrid and monohybrid crosses
C)Monohybrid cross only
D) Dihybrid but not monohybrid cross

21) Lack of independent assortment between two genes A &B would be due to
A) Crossing over
B) Linkage
C) Repulsion
D) Recombination

22) Percentage of recombination between A&B is 9%, A&C 17% and B&C is 26%. The arrangement of genes would be
A) A-B- C
B) A-C- B
C) B-C- A
D) B-A- C

23) Out of a population of 800 individuals in F2 generation of a cross between yellow round and green wrinkled Pea plants, what would be number of yellow and wrinkled seeds ?
A) 800
B) 400
C) 200
D) 150

24) Independent assortment is absent in case of
A) Genes located on the same chromosome
B) Genes located on homologous chromosomes
C) Genes located on non-homologous chromosomes
D) All of the above

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