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5.PRINCIPLES OF INHERITANCE AND VARIATION (1.)In a given plant, red colour ( R ) of fruit is domi- nant over white fruit ( r); and tallness ( T ) is dominant over dwarfness ( t ). If a plant with genotype RRTt is crossed with a plant of genotype rrtt, what will be the percentage of tall plants with red fruits in the next gen- eration? (a.) 100% (b.) 25% (c.) 50% (d.) 75% (2.)In the ABO system of blood groups, if both anti- gens are present but no antibody, the blood group of the individual would be (a.) B (b.) O (c.) AB (d.) A (3.)Starch synthesis gene in pea plant in heterozygous condition produces starch grain of intermediate size. This shows (a.) Complete dominance (b.) Incomplete dominance (c.) Codominant (d.) Dominant (4.)If heterozygous dominant (tT) crossed with homo- zygous dwarf plant, then the percentage of progeny having dwarf character is (a.) 60% (b.) 40% (c.) 50% (d.) 70% (5.)Lack of independent assortment of two genes-A and B in fruit fly-Drosophila is due to (a.) Repulsion (b.) Recombination (c.) Linkage (d.) Crossing over (6.)Phenotype of an organism is the result of (a.) Mutations and linkages (b.) Cytoplasmic effects and nutrition (c.) Environmental changes and sexual dimorphism (d.) Genotype and environment interactions (7.)The following diagram shows two chromosomes and the lettered number represents the genes Which of the following would result if a translocation occurred between chromosome 1 and 2? (a.) (b.) (c.) (d.) (8.)The phenotypic ratio of a monohybrid cross in F2- generation is (a.) 3 :1 (b.) 1 : 2 : 1 (c.) 2 : 1 : 1 (d.) 9 : 3 : 3 : 1 (9.)In sickle-cell anaemia, GAG is replaced by (a.) GGA (b.) GUG (c.) AAG (d.) GGG (10.)The mutant haemoglobin molecule undergoes polymerization under low oxygen tension causing the change in the shape of RBC from biconcave to elon- gated structure. This property of RBC is found in (a.) Haemophilia (b.) Colour blindness (c.) Phenylketonuria (d.) Β-thalassaemia (11.)Lack of independent assortment of two genes ‘A’ and ‘B’ in fruit fly-Drosophila is a due to (a.) Repulsion (b.) Recombination (c.) Linkage (d.) Crossing over (12.)Who clearly proved and define linkage? (a.) Morgan (b.) Castle (c.) Bateson (d.) Punnett (13.)Rrrr progeny : Red (dominant) flowered heterozy- gous crossed with white flower (a.) 350 → red ∶ 350 → white (b.) 450 → red ∶ 250 → white (c.) 380 → red ∶ 250 → white (d.) None of these (14.)Experimental evidence of chromosomal theory of inheritance was given by (a.) HT Morgan (b.) TH Morgan (c.) H de Vries (d.) DH Vries (15.)Improvement of human race through hereditary qualities is called (a.) Euthenics (b.) Human heredity (c.) Human demography (d.) Eugenics (16.)The factors which expresses only in homozygous condition is


(44.)Total number of wrinkled seed in previous ques- tion (a.) 4 (b.) 3 (c.) 2 (d.) 1 (45.)...A... genes are those which occurs on the same chromosome and ...B... genes are those, which are present on different chromosome. Choose correct choice for A and B (a.) A-linked; B-unlinked gene (b.) A-unlinked; B-linked (c.) A-identical; B-non-identical (d.) A-non-identical; B-identical (46.)In cross between yellow round (YYRR) and green wrinkled (yyrr) find out the ratio between seeds having yellow and green seed colour (a.) 3 : 2 (b.) 3 : 1 (c.) 9 : 7 (d.) 7 : 9 (47.)Which is a sex-influenced disease? (a.) Baldness in male (b.) Haemophilia (c.) Xeroderma pigmentosa (d.) Down’s syndrome (48.)Some individuals with blood group –A may in- herit the genes for blonde hair, while other individuals with blood group – A may the gene for brown hair. This can be best explained by the principle of (a.) Dominance (b.) Multiple alleles (c.) Independent assortment (d.) Incomplete dominance (49.)A hereditary, disease, which is never passed on from father to son is (a.) X-chromosomal linked disease (b.) Autosomal linked disease (c.) Y-chromosomal linked disease (d.) None of the above (50.)The tendency of offsprings to resemble their par- ents is called (a.) Variation (b.) Heredity (c.) Inheritance (d.) Resemblance (51.)Gamete mother cells of the chromosome 44 + XY suffers from non-disjunction at first meiotic division. Which of the following set of gametes would result? (a.) 22 + XX, 22 + XY, and 22, 22 (b.) 22 + XY, 22 + XY, and 22, 22 (c.) 22 + X, 22 + Y, and 22 + Y, 22 (d.) 22 + X, 22 + XY, and 22 + Y, 22 + Y (52.)In sickle cell anaemia, the glutamic acid is re- placed by (a.) Proline (b.) Alanine (c.) Serine (d.) Valine (53.)The most popularly known blood grouping is the ABO grouping. It is named ABO and not ABC, be- cause ‘O’ in it refers to having (a.) Other antigens besides A and B on RBCs (b.) Over dominance of this type on the genes for A and B types (c.) One antibody only−either anti-a or anti–b on the RBCs (d.) No antigens A and B on RBCs (54.)A women with blood-O has a child with blood group-O. She claims that a man with blood group-A is the father of her child. What would be the genotype of the father, if her claim is right? (a.) I OI O (b.) I AI B (c.) I AI O (d.) I B I O (55.)Mendel cross tall and dwarf plant. In F2-genera- tion the observed ratio was 3:1 (tall: short). From this result, he deduced I. law of dominance II. law of independent assortment III. law of segregation IV. incomplete dominance Choose the correct option (a.) I, II, III and IV (b.) I and III (c.) II, III and IV (d.) I, II and III (56.)When tall and dwarf plants are crossed, from which cross 1 : 1 ratio is obtained? (a.) Tt and tt (b.) tt and tt (c.) Tt and Tt (d.) TT and Tt (57.)Which phenomena leads to the variation in DNA (a.) Mutation (b.) Linkage (c.) Both (a) and (b) (d.) Mitosis (58.)Mutations are generally induced by means of (a.) α − rays (b.) β − rays (c.) γ − rays (d.) UV radiations (59.)A man and a woman, who do not show any appar- ent sign of a certain inherited disease, have seven chil- dren (two daughter and five sons). Three of the sons suffer from the given disease but none of the daughters