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<€y Multiple Choice Questions (MCQs), , , , , , (A) NAME THE FOLLOWING BY CHOOSING THE CORRECT OPTION:, , Q1,, , Q2., , Q3., , Q4., , Q5., , Qe., , Q.7., , Qs., , Q9., , Q.10., , Q.11., , Q.12.', , The genetic material that is responsible for inheritance of traits., (a) Chromosomes (b) DNA, (0) Genes (@ Chromatin, , The Mendel’s law which states that two members of a pair of factors separate without blending with, each other during the formation of gametes is :, , (a) Law of Dominance (b) Law of Segregation, , (c) Law of Independent assortment (@) None of these, , A sudden change in the gene which is heritable from one generation to other., (a) Variation (b) Cloning, , (c) Evolution (d) Mutation, , The plant that was used by Gregor Mendel for his experiment., , (a) Onion plant (b) Carrot plant, , (c) Pea plant (d@) Lily plant, , The term that represents a pair of contrasting characters., , (a) Heterozygous (b) Homozygous, , (©) Factors (d) Allelomorphs, , The process where characteristics are transmitted from parent to offsprings., @ Variation (b) Heredity, , (c) Gene (d) Allele, , The phenomenon where individuals of a species exhibit differences in characteristics., (a) Adaptation (b) Evolution, , (c) Variation (@) Mutation, , The animal produced by a cross between horse and zebra., , (a) Hebra (b) Zorse, , (c) Gebra (@) None of these, , The scientific name of garden pea used by Mendel in his experiment., , (a) Allium cepa (b) Solanum tuberosum, , (c) Solanum lycopersicum tees (@) Pisum satioum, , The scientist who used the term genetics for the first time., , (2) G. Mendel satay cxcan OW,BAReSO oer, , (c) Nollet (@ W. Harvey, , The full complement of DNA of an organism., , (a) Chromosome (b) Gene, , (c) Genome ; (@ None of these L, ‘The animal produced by a lion and’tigerss crossbréed. °""- ~~ {of, (a) Tigon (b) Liger, , (c) Zorse (d) Zenkey

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Q.43. A homozygous purple flower variety of pea plant [PP] is crossed with white flower variety of pea, [pp]. The phenotype and genotype of the F, generation of offsprings is :, (a) Phenotype - All pea plants with purple flower, , - Genotype - All plants are Pp an, , | () Phenotype - Some pea plants with purple flower and some with white flower I, , Genotype - All plants are Pp, , (c) Phenotype - All pea plants with purple flower, , ; Genotype - Some plants are Pp and some are pp, , (4) Phenotype - All pea plants are Pp, , 3, , :, , , , Genotype - All plants are with purple flower *, Q.14. If the offsprings of the F, generation are crossed (in the above question), what will be the phenotypic”, and genotypic ratios of the F, generation? 2, , (a) The phenotypic ratio of the F, generation is 1:3, The Genotypic ratio of the F, generation is 1:2:1, , (8) The phenotypic ratio of the F, generation is 3:1, The Genotypic ratio of the F, generation is 2: 2:1, , (©) The phenotypic ratio of the F, generation is 3:1, The Genotypic ratio of the F, generation is 1:2:2, , (4) The phenotypic ratio of the F, generation is 3:1, The Genotypic ratio of the F, generation is1:2:1, , (B) COMPLETE THE FOLLOWING STATEMENTS BY CHOOSING THE APPROPRIATE OPTION, FOR EACH BLANK: ¢, , , , NA, Q.15. A cross between two tall plants resulted in offspring having few dwarf plants. The genotypes of both’, the parents are ., , , , , , (2) TT and Tt (@Ttand Tt, () TT and TT (@) Ttand tt A, Q.16. Colour based contrasting traits in seven contrasting pairs, studied by Mendel in pea plant were _~*., @1 2, (93 (a4, Q.17. Genes which code for a pair of contrasting traits are known as, (a) dominant genes (6) alleles, (0) linked genes (d) none of these, Q.18. A recessive allele is expressed in, (a) heterozygous condition only (4) homozygous condition only i, (c) F; generation 7 ‘@ both homozygous and heterozygous conditions., Q.19. The characters which appear in the first filial generation are called, (a) recessive characters (b) dominant characters, (o holandric characters (@) lethal characters, , , , , , Q.20. In a monohybrid cross between two heterozygous individuals, percentage of pure homozygous ,, individuals obtained in F, generation will be a Abe, (a) 25% (2) 50 % }, () 75% (@ 100 % ‘

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Q.21. What is the probability of production of dwarf offsprings in a cross between two heterozygous tall, , pea plants ?, (a) Zero (b) 50 %, (Cc) 25% | (ad) 100 %, Q.22. Which of the following crosses will give tall and dwarf pea plants in same proportions ?, (a) TT x tt (b) Te x tt, (c) TT x Tt : (d) tt * tt, Q.23. A couple has six daughters. What is the possibility of their having a girl next time ?, (a) 10 % (b) 50 %, (c) 90% (a) 100 %, Q.24. Rate of mutation is affected by, (a) temperature (b) X-rays, (c) gamma rays (@) all of these, , (C) CHOOSE THE CORRECT ANSWER FROM EACH OF THE FOUR OPTIONS GIVEN BELOW:, , Q.25. Mendel’s law of independent assortment does not hold true for the genes that are located closely on, (a) same chromosome (b) non-homologous chromosomes, (c) X-chromosome (d) autosomes, , Q.26. In humans if gene B gives brown eyes and gene b gives blue eyes, what will be the colour of eyes of, the persons having combinations (i) Bb and (ii) BB? ., , (a) () Blue and (i) Brown (5) (i) Brown and (ii) Blue, (©) (i) Brown and (ii) Brown (@ (@ Blue and (ii) Blue, Q.27. Across between two individuals results ina ratio of 9:3 :3 :1 for four possible phenotypes of progeny., This is an example of a, (2) Monohybrid cross (b) Dihybrid cross, (c) Test cross (@) F, generation, Q.28. From the list given below, select the character which can be acquired but not inherited, (a) colour of eye (b) colour of skin, (0) size of body ‘ (d) nature of hair, Q.29, : Which one is not a genetic disease?, (a) Haemophilia : (b) Thalassaemia, (c) Sickle cell anaemia (d) Tuberculosis, Q.30. Pea plants were used in Mendel’s experiments because ., (a) They were cheap of (® They had contrasting characters, (c) They were available easily (d) All of the above, , Q.31. In peas, a pure tall plant (TT) is crossed with a pure short plant (tt). The ratio of pure tall plants to, pure short plants in F, generation will be:, , (a)1:3 (b)3:1, (c)1:1 (d)2:1

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Q.32. Which of the following determines the sex of a child?, , Q.33., , Q3., , (a) 60 @) 23, , (jr (a) 40, , Which of the following characters in human is dominant?, , (2) Free ear lobe (6) Colourblind vision, , (c) Rh factor negative (@) Left handedness, (D) EXPLAIN THE FOLLOWING TERMS:, ——$, , Phenotype, , Q35., , Q36., , Q38., , Q39., , Q.40., , ~ Traits, , (a) The length of the mother’s pregnancy, , (b) The length of time between ovulation and copulation, (c) The presence of an X chromosome in an ovum, , (d) The presence of a Y chromosome in a sperm, , , , Ifa normal cell of human body contains 46 pairs of chromosomes then the numbers of chromosom,, in a sex cell of a human being is most likely to be: f, , (2) Observable characteristics which are genetically controlled., , (t) Observable characteristics which are not genetically controlled., , (©) Genetic constitution of an individual, , (¢) Set of genes present in the cells of organism., , Dihybrid cross, , (a) A cross between individuals having one pair of contrasting traits., (b) A cross between individuals having two pairs of contrasting traits., (<) A cross between individuals having three pairs of contrasting traits., (4) A cross between individuals having four pair of contrasting traits., , , , (2) Any heritable feature of an organism, , (t) Transmission of genetically based characteristics from parents to offspring, (c) Alternative forms of a character, , (4) Small differences among the individuals of same species, , Genetic engineering, , (2) Genetic constitution of an organism altered by inedocitg new genes into its chromosomes, (t) Full complement of a DNA of an organism, , , , (c) Sudden change in one or more genes of an To, , (4)Allofthese geet Serer, , Polydactyly ', , (a) Total absence of skin pigmentation (6) Inability to straighten the little finger -,, , (©) Extra fingers and toes (4) Alternative forms of a gene, , Genotype, , (2) Observable characteristics which are genetically controlled. <3), (b) Observable characteristics which are not genetically controlled. - yay, (c) Genetic constitution of an individual wd ia es S)), (d) Set of genes present in the cells of organism. t 7

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'Q.41. Homozygous, , t (a) Individual in which both factors or genes controlling one character are similar, , (b) Individual in which both factors or genes controlling one character are dissimilar, , (c) Individuals genetic constitution, , (d) Individuals showing small differences, , Q.42. Locus, , (a) Ancestral line of an individual (b) Fixed position of a gene in a chromosome, (c) Morphological expression of an individual (d) None of these, , (E) DIAGRAM BASED QUESTIONS, , Q.43. Red green colourblindness is a sex linked inherited characteristic. The gene b colourblindness is, recesive to the gene B for normal vision. The gene b is carried only on the X chromosome., , a], , B b b B, x Xx x Y xy, (@) 2) 8) }, , (i) The phenotypes of (1), (2) and (3) are, (a) 1. Carrier female 2. Sufferer male 3. Normal male, (b) 1. Normal female 2. Sufferer male 3. Normal male, (0)1. Carrier female 2. Normal male 3. Sufferer male, (d@) 1. Carrier female 2. Sufferer male 3. Sufferer male, ' (i) Red green colourblindness is more likely to occur in men than in women because |, (a) In women if one X chromosome is defective the other masks its effect |, (b) In men they do not have XX chromosome so are sufferer |, (c) Women are not exposed to pollution outside !, d) Men are exposed to antigens hence are sufferer |, }: (iii) Reason why Mendel selected pea plant for his experiment is, (a) Self pollination could not be prevented, (b) Many varieties were not available having contrasting traits, (c) Varieties were available in pure forms that bred true, (d) Reproductive span of pea plant is very long, . The following table is of contrasting ¢ characters given by Mendel:, z f 2 | MlRecessive ill, 1 Plant height @) (ii), 2 Seed shape (tii) (i), Identify (i), (ii), (fii) and (ie), (a) (i) Dwarf (ii) Tall (it) Round (iv) Wrinkled ,, (b) (i) Tall (i) Round (iii) Dwarf (iv) Wrinkled : ‘A, (c) (i) Tall (ii) Dwarf (iii) Dwarf (iv) Wrinkled yj. <, (d) (i) Tall (ii) Dwarf (iii) Round (iv) Wrinkled