Q.1
on Q204) what is called pleiotropism ?
  • a) Phenomenon of multiple effect of a simple gene
  • b) Phenomenon of multiple effect of multiple genes
  • c) Phenomenon of multiple effect of multiple alleles
  • d) all of the above
Q.2
on Q205) In Bonellia all larva are genetically and cytologically similar. In this worm mole individuals live inthe uterus of female. If a particular larva settle near proboscis of an adult female, it becomes a male individuals. Larva develops free in water it becomes.
  • a) Male individuals
  • b) Female individuals
  • c) Inter Sex
  • d) Super female
Q.3
on Q206) Klinefelter's syndrome is developed when the chromosome in male is
  • a) XXY
  • b) XXXY
  • c) XXYY
  • d) All of these
Q.4
on Q207) A colour-blind man marries the daughter of a colour-blind person. In their progeny
  • a) none of her daughters are colour-blind
  • b) all her sons are colour-blind
  • c) all her daughters are colour-blind
  • d) half of her sons are colour-blind
Q.5
on Q208) Which of the following is a recessive trait for a character chosen by Mendel in garden pea?
  • a) Violet flower colour
  • b) Yellow pod colour
  • c) Axial flower position
  • d) tall stem height
Q.6
on Q209) A couple has a daughter. What is the probability that their next child will be a daughter?
  • a) 0 %
  • b) 25 %
  • c) 50 %
  • d) 100 %
Q.7
on Q210) A female whose father was colour-blind marries and normal male whose father was also colour-blind. What is the probability that their daughter will be colour-blind?
  • a) 0 %
  • b) 25 %
  • c) 50 %
  • d) 75 %
Q.8
on Q211) If a colour-blind man marries a woman who is homozygous for normal colour vision, the probability of their son being colour-blind is
  • a) 0
  • b) 0.5
  • c) 0.75
  • d) 1
Q.9
on Q212) The incorrect statement with regard to haemophilia is
  • a) it is a sex-linked disease
  • b) it is a recessive disease
  • c) it is a dominant disease
  • d) a single protein involved in the clotting of blood effected
Q.10
on Q213) ABO blood groups in humans are controlled by the gene I. It has three alleles — IA, IB and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?
  • a) Three
  • b) One
  • c) Four
  • d) Two
Q.11
on Q214) Which one of the following is the most suitable, medium for culture of Drosophila melanogaster?
  • a) Moist bread
  • b) Agar agar
  • c) Ripe banana
  • d) Cow dung
Q.12
on Q215) Which of the following chromosomal disorders is the commonest in the new borns?
  • a) Edward's syndrome
  • b) Patio’s syndrome
  • c) Down's syndrome
  • d) None of these.
Q.13
on Q216) The ratio in a dihybrid test cross between two individuals is given by
  • a) 2:1
  • b) 1:2:1
  • c) 3:1
  • d) 1:1:1:1
Q.14
on Q217) Which of the following is true for a recessive disease in family A and B?
unit-7_ch-2_que_no-217_img_no1.png
  • a) In family A, both the parents are homozygous recessive.
  • b) In family B, both the parents are homozygous dominant
  • c) In family B, both the parents are heterozygous recessive.
  • d) In family A, both the parents are heterozygous recessive.
Q.15
on Q218) A pea plant parent having violet-coloured flowers with unknown genotype was crossed with a plant having white-coloured flowers. In the progeny, 50% were white. The genotypic constitution of the parent having violet-coloured flowers was
  • a) homozygous
  • b) merozygous
  • c) heterozygous
  • d) Hemizygous
Q.16
on Q219) For how many years Gregor Mendel conducted hybridisation experiments on garden peas?
  • a) 5
  • b) 7
  • c) 14
  • d) 34
Q.17
on Q220) What is the cause of variation?
  • a) Asexual reproduction
  • b) Amitosis
  • c) Mitosis
  • d) Meiosis
Q.18
on Q221) Mendel’s principle of segregation means that the germ cells always receive:
  • a) One pair of alleles.
  • b) One quarter of the alleles.
  • c) One of the paired alleles.
  • d) Any pair of alleles.
Q.19
on Q222) Which among the following is an inborn error in metabolism?
  • a) Phenylketonuria.
  • b) Sickle cell anaemia.
  • c) Down’s syndrome.
  • d) Thalassemia.
Q.20
on Q223) In a true breeding tall or dwarf pea variety the possible set of allelic pair(s) of genes for height are
  • a) TT, Tt, tt
  • b) TT, tt
  • c) TT
  • d) tt
Q.21
on Q241) Phenotypic ratio 3:1 proves
  • a) Dominance
  • b) Segregation
  • c) Crossing over
  • d) Independent Assortment
Q.22
on Q224) ABO blood grouping provides an example of (i) co-dominance (ii) Multiple allelism (iii) Incomplete dominance
  • a) i and iii
  • b) i and ii
  • c) ii and iii
  • d) i, ii and iii
Q.23
on Q225) What does Blending inheritance refers to?
  • a) Mixed characters in an offspring
  • b) Dominant character
  • c) Recessive character
  • d) Dominant & recessive character
Q.24
on Q226) What will be the ratio of homozygous dominant, homozygous recessive and pure heterozygous traits in F2 generation in pea plant is
  • a) 1: 1: 8
  • b) 2: 3: 2
  • c) 1: 1: 2
  • d) 2: 2: 6
Q.25
on Q227) In a cross between AABB X aabb, the ratio of F2 genotypes between AABB, AaBB, Aabb and aabb would be:
  • a) 9 : 3 : 3 : 1
  • b) 2 : 1 : 1 : 2
  • c) 1 : 2 : 2 : 1
  • d) 7 : 5 : 3 : 1
Q.26
on Q228) Two pure lines of corn have mean cob lengths of 9 and 3 inches respectively. The polygenes involved in this trait all exhibit additive gene action. Crossing these two lines is expected to produce a progeny with mean cob length [in inches] of:
  • a) 12.0
  • b) 7.5
  • c) 6.0
  • d) 2.75
Q.27
on Q229) Sickle cell anaemia is a classic example of
  • a) Point mutation
  • b) silent mutation
  • c) Frame shift mutation
  • d) non sense mutation
Q.28
on Q230) If a haemophilic female who marries a normal male gives birth to a male child, then what are the chances of boy being normal? (a hypothetical situation but it won’t happen practically)
  • a) 0%
  • b) 50 %
  • c) 25%
  • d) 75%
Q.29
on Q231) Sickle cell anaemia is caused by
  • a) Substitution of valine by glutamic acid at 6th position in the polypeptide.
  • b) Substitution of valine by glycine at 4th position in the polypeptide.
  • c) Substitution of glutamic acid by valine at 4th position in the polypeptide.
  • d) Substitution of glutamic acid by valine at 6th position in the polypeptide.
Q.30
on Q232) What is the characteristic feature of haplodiploid sex determination?
  • a) Males produce sperms by mitosis
  • b) Number of sets of chromosomes present in progenies will decide their sex
  • c) Workers will have diploid set of chromosomes.
  • d) Drones will have haploid set of chromosome.
Q.31
on Q233) if two brown eyed people marry each other and each one had one blue eyed parent. What is the proportion of eye colour in their offspring?
  • a) 3:1
  • b) 1:4
  • c) 1:2
  • d) 2:2
Q.32
on Q234) Fruit fly is excellent model of genetics because of: (i) Small life cycle (two weeks). (ii) Can be fed on simple synthetic medium. (iii) Single mating produces large number of progeny. (iv) Clear differentiation of sexes. (v) Many heredity variations can be seen with low power microscopes. Choose the correct options:
  • a) (i), (ii) and (iii).
  • b) (iii), (iv) and (v).
  • c) (i), (iv) and (v).
  • d) All of these.
Q.33
on Q235) “Independent pairs segregate independent of each other”: This statement is applicable to the segregation of:
  • a) Alleles of genes.
  • b) Chromosome pairs.
  • c) Alleles of gene and chromosome pairs.
  • d) Not true regarding both alleles of genes and chromosome pairs.
Q.34
on Q236) If Mendel had studied 7 traits using a plant with 12 chromosomes instead of 14, he would have
  • a) Discovered incomplete dominance
  • b) Not discovered the law of independent assortment
  • c) Discovered sex linkage
  • d) Mapped the chromosomes
Q.35
on Q237) Match the human genetic disorders with the causative abnormal chromosomes.
List I List II
A. Sickle cell anaemia Sex linked (X chromosome)
B. Colour blindness Autosomal chromosome 7
C. Phenylketonuria Autosomal chromosome 11
D. Cystic fibrosis Autosomal chromosome 4
E. Huntington's disease Autosomal chromosome 12
  • a) A- 3, B- 5, C- 1, D- 2, E- 4.
  • b) A- 5, B- 1, C- 2, D- 3, E- 5
  • c) A- 4, B- 1, C- 5, D- 2, E- 3
  • d) A- 3, B- 1, C- 5, D- 2, E- 4
Q.36
on Q238) In a plant, gene X is responsible for flower colour, Y for plant height and Z for fruit shape. Recombination frequency of tall plant with white flower is 15% and tall plant with wrinkled fruit is 27% and white flower with wrinkled fruit is 12%. Then how is the arrangement of these genes on the chromosome?
  • a) XYZ.
  • b) XZY.
  • c) YXZ.
  • d) YZX.
Q.37
on Q239) If an organism having the chromosome number 2n = 36; the number of chromosome in triploidy, trisomy, monosomy, Tetrasomy, Nullisomy will be:
  • a) 54, 37, 35, 38, 34.
  • b) 36, 37, 35, 38, 34.
  • c) 54, 37, 34, 39, 36.
  • d) 36, 37, 34, 39, 36.
Q.38
on Q240) The chromosome arrangement in diploid cell is AABBCCDD. It has undergone numerical change in such a way that AABCCCCDD, it can be numerically represented as:
  • a) 2n + 1 + 2.
  • b) 2n – 1 + 2.
  • c) 2n + 2 – 1.
  • d) 2n – 1 + 1.
Q.39
on Q242) In a plant, gene "T" is responsible for tallness and its recessive allele "t" for dwarfness and "R" is reponsible for red colour flower and its recessive allele "r" of white flower colour. A tall and red flowered plant with genotype TtRr crossed with dwarf and red flowered ttRr. What is the percentage of dwarf - white flowered offspring of above cross ?
  • a) 50%
  • b) 6.25%
  • c) 12.5 %
  • d) 50 %
Q.40
on Q243) Segregation of genes take place during which phase of cell division ?
  • a) Metaphase
  • b) Anaphase
  • c) prophase
  • d) Embryo formation
Q.41
on Q244) In humans , height shows a lot of variation . It is an example of
  • a) Multiple alleles
  • b) Pleiotropic inheritance
  • c) polygenic inheritance
  • d) False allelic inheritance
Q.42
on Q245) In a plant, red fruit (R) dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t). If a plant with RRTT genotype is crossed with a plant that is rrtt. Then
  • a) 25% will be tall with red fruit
  • b) 50% will be tall with red fruit
  • c) 75% will be tall with red fruit
  • d) All of the offspring will be tall with red fruits
Q.43
on Q246) State the mutant gene Which converts the male flowers into female flowers In Maize plant
  • a) TA TA
  • b) ta ta
  • c) TA Ta
  • d) Both (A) & (C)
Q.44
on Q247) "Large thick and Swollen tongue and droping lips"----- are the symptoms of which genetical disorder
  • a) Autosomal aneuploidy
  • b) Trisomy of 21st chromosome
  • c) Down’s syndrome
  • d) Total number of chromosomes become 47
Q.45
on Q248) What does the diagram represent ?
unit-7_ch-2_que_no-248_img_no1.png
  • a) synapsis Zygotene
  • b) crossing over, Diplotene
  • c) Tetrad, Pachytene
  • d) Terminalization, Diakinesis
Q.46
on Q249) Asserton (A) :- Alkaptonuria is not an inborn error in metabolism Reason (R) It is caused by crossing over.
  • a) If both (A) and (R) are true and (R) is the correct explanation of (A)
  • b) If both (A) and (R) are true but (R) is not the correct explanation of (A)
  • c) If (A) is true but (R) is false
  • d) If both (A) and (R) are false.
Q.47
on Q250) A woman with normal vision, but whose father was colourblind, marries a colourblind man. Suppose that the fourth child of this couple was a boy. This boy
  • a) May be colourblind or may be of normal vision
  • b) Must be colourblind
  • c) Must have normal colour vision
  • d) Will be partially colourblind since he is heterozygous for the colourblind mutant allele.
Q.48
on Q251) What was the most significant conclusion that Gregor Mendel drew from his experiments with pea plants?
  • a) There is considerable genetic variation in garden peas.
  • b) Traits are inherited in discrete units, and are not the results of ʺblending.ʺ
  • c) Genes are composed of DNA.
  • d) An organism that is homozygous for many recessive traits is at a disadvantage.
Q.49
on Q252) Test cross involves .... ...
  • a) Crossing between two genotypes with dominant trait
  • b) Crossing between two genotypes with recessive trait
  • c) Crossing between two F1 hybrids
  • d) Crossing the F1 hybrid with a double recessive genotype
Q.50
on Q253) A human male produces sperms with the genotypes AB , Ab , aB , 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
0 h : 0 m : 1 s