MULTIPLE CHOICE QUESTIONS

For C.E.T. EXAMINATIONS 2011

BY

Dr. M.J.SUNDAR RAM

SURANA IND. PU COLLEGE, BANGALORE

1. During gamete formation in Mendel’s expts:

1. Gametes carry the same no. of alleles as the

parents & both alleles of a pair enter the same

gamete.

2. Gametes carry half the no. of alleles as the

parents & the 2 alleles of a pair cannot enter

the same gamete.

3. Gametes carry half the no. of alleles as the

parents & both alleles of a pair enter the same

gamete.

4. Gametes carry the same no. of alleles as the

parents & the 2 alleles of a pair cannot enter

the same gamete.

2. Column A shows the genotypes of pea plants

and column B shows the type of cross in Mendel’s

expt. Match the 2 and choose the correct answer:

1. 1-p, 2-q, 3-r, 4-s

2. 1-q, 2-r, 3-s, 4-p

3. 1-r, 2-s, 3-p, 4-q

4. 1-r, 2-q, 3-p, 4-s

GENOTYPE TYPE OF CROSS

1. TT X tt p. Test cross

2. Tt X Tt q. Reciprocal cross

3. Tt X tt r. Parental cross

4. TT (male) X tt female)

TT (female) X tt male)

s. Cross between F1 plants

3. When Mendel crossed a plant producing yellow

round seeds with a plant producing green

wrinkled seeds, he obtained both parental combi-

nations and recombinations in the F2 generation.

The ratio between parental combinations &

recombinations was:

1. 9:3:3:1

2. 10:6

3. 3:1

4. 15:1

4. If a gene on the X chromosome does not

have a corresponding allele on the Y

chromosome, this condition is known as:

1. heterozygous condition

2. holozygous condition

3. hemizygous condition

4. homozygous condition

5. In pea plants yellow colour of seeds is

dominant over green and round shape dominant

over wrinkled. A plant producing yellow round

seeds is crossed with a plant producing green

wrinkled seeds. F1 generation consists of yellow

round, yellow wrinkled, green round and green

wrinkled in the ratio of 1:1:1:1. Hence the

genotype of the yellow round parent is:

1) YYRR

2) YyRR

3) YYRr

4) YyRr

6. Column 1 contains contributions and column 2

the names of scientists. Match them and choose

the correct answer:

1. 1-a, 2-b, 3-c, 4-d

2. 1-a, 2-d, 3-c, 4-b

3. 1-d, 2-c, 3-a, 4-b

4. 1-c, 2-a, 3-b, 4-d

1. scientist’s contribution 2. Name of scientist

1. ABO blood groups a. Mendel

2. Sex linkage b. Correns

3. Principles of heredity c. Morgan

4. Rediscovery of Mendel’s work d. Landsteiner

7. A gene on the Y chromosome without a

corresponding allele on the X chromosome is

inherited from father to son. This condition is

referred to as:

1. Holozoic condition

2. Holandric condition

3. Hologynous condition

4. Homozygous condition

8. When the homologous chromosomes during

Anaphase I of Meiosis fail to separate and move

to the same pole it is said to be:

1. Disjunction

2. Dislocation

3. Non-disjunction

4. Translocation

9. Which of the following statements is true:

1. If you are A positive you can donate blood to A

positive, AB positive, A negative, AB negative persons.

2. If you are AB positive you can receive blood from A

positive, A negative, B positive, B negative, AB

positive, AB negative, O positive, O negative persons.

3. If you are O positive you can donate blood to A

positive, A negative, B positive, B negative, AB

positive, AB negative, O positive and O negative

persons.

4. If you are B negative you can receive blood from B

positive, B negative, O positive, O negative persons.

10. Column 1 gives the blood-antiserum reactions

& column 2 gives the blood group of the blood

tested. Match the two & choose the right answer:

1) 1-a, 2-b, 3-c, 4-d

2) 1-b, 2-a, 3-d, 4-c

3) 1-c, 2-d, 3-a, 4-b

4) 1-d, 2-c, 3-b, 4-a

1. Blood-antiserum reaction 2. Blood group

1. Blood clots in A & B antisera a. A group

2. Blood clots in A but not in B antiserum b. AB group

3. Blood clots in B but not in A antiserum c. O group

4. Blood does not clot in either antisera d. B group

11. According to Landsteiner:

1. If the agglutinogen is present in the RBC, the

corresponding agglutinin must be absent in

the plasma.

2. If the agglutinogen is present in the RBC, the

corresponding agglutinin must also be present

in the plasma.

3. If an agglutinogen is absent in the RBC, the

corresponding agglutinin must also be absent

in the plasma.

4. If an agglutinogen is absent in the plasma, the

corresponding agglutinin must be present in

the RBC.

12. If a couple have 4 children, each belonging to

blood groups A, B, AB and O, then the genotypes

of the couple are:

1. Homozygous for A and homozygous for B

2. Homozygous for A and heterozygous for B

3. Heterozygous for A and heterozygous for B

4. Heterozygous for A and homozygous for B

13. The blood group of a person is determined by

mixing his blood with serum. Serum means:

1. Plasma containing only platelets.

2. Plasma that is separated from clotted blood.

3. Plasma devoid of formed elements

4. Plasma containing only white blood cells.

14. One of the following scientists was not

responsible for rediscovery of Mendel’s work:

1. Morgan

2. Tschermak

3. Hugo De Vries

4. Correns

15. Which of the following is an example of

holandric inheritance:

1. Colourblindness

2. Sickle cell anemia

3. Hypertrichosis

4. Hemophilia

16. The figure below displays the karyotype of a

person suffering from a genetic disorder. Identify

the disorder:

1) Down’s syndrome

2) Klinefelter’s syndrome

3) Turner’s syndrome

4) Cri du chat syndrome

17. Column 1 contains terms and column 2

contains their definitions. Match them and choose

the right answer:

1. 1-a, 2-b, 3-c, 4-d

2. 1-b, 2-c, 3-d, 4-a

3. 1-c, 2-a, 3-d, 4-e

4. 1-d, 2-a, 3-b, 4-c

1. Term 2. definition

1. Phenotype a. Organism possessing 2 different alleles

2. Heterozygous b. A trait which expresses itelf in F1

3. Serum c. Appearance of an organism

4. Recessive d. Plasma without clotting proteins

- e. A trait which cannot express itself

18. In 4 O’clock plant Mirabilis jalapa, pink

flower-producing plants were produced when:

1. 2 red flowered plants were crossed

2. a pink flowered plant was crossed with a white

flowered plant

3. two white flowered plants were crossed

4. a red flowered plant was crossed with a white

flowered plant

19. The phenotypic ratio in a monohybrid cross

showing incomplete dominance is:

1. 9:3:3:1

2. 1:2:1

3. 3:1

4. 1:2:1:2:4:2:1:2:1

20. A test cross means:

1. The F1 organism is allowed to self pollinate.

2. The F1 organism is crossed back to the

dominant parent.

3. The homozygous dominant parent is crossed

with the recessive parent.

4. The F1 organism is crossed back to the

recessive parent.

21. Hemophilia is a sex-linked hereditary

disorder which is characterised by:

1. Absence of RBCs in the blood

2. The clotting mechanism is defective

3. Too many white blood cells in the blood

4. Low count of platelets

22. A pea plant producing yellow round seeds is

crossed with a green wrinkled plant (yyrr). Two

types of offspring are produced – those produc-

ing yellow round seeds & those producing yellow

wrinkled seeds in the ratio of 1:1. The genotype

of the yellow round plant is:

1. YYRR

2. YYRr

3. YyRR

4. YyRr

23. In which of the following situations there is

risk of the child contracting erythroblastosis

foetalis:

1. Mother Rh positive & foetus Rh positive

2. Mother Rh positive & foetus Rh negative

3. Mother Rh negative and foetus Rh positive

4. Mother Rh negative & foetus Rh negative

24. A child which is afflicted with one of the

following disorders cries like a cat:

1. Hemophilia

2. Cri du chat syndrome

3. Sickle cell anaemia

4. Turner’s syndrome

25. Column 1 contains chromosomal disorders

and 2 their chromosomal peculiarity. Match them

correctly & choose the correct answer:

1. 1-b, 2-c, 3-a, 4-e

2. 1-a, 2-b, 3-c, 4-d

3. 1-e, 2-a, 3-d, 4-b

4. 1-d, 2-e, 3-c, 4-b

1. DISORDER 2. CHROMOSOMAL PECULIARITY

1. Turner’s syndrome a. 45A + XX/XY = 47 chromosomes

2. Klinefelter’s syndrome b. 44A + XO = 45 chromosomes

3. Down’s syndrome c. 44A + XXY = 47 chromosomes

4. Cri du chat syndrome d. 44A + XX/XY = 46 chromosomes

-- e. 44A + XX/XY = 46; deletion of short arm

of 5th chromosome

26. Erythroblastosis foetalis is a blood disorder

in which:

1. The mother’s blood stops circulation into the

foetus, leading to its death.

2. The child’s blood develops anti Rh antibodies

and destroys the RBCs of the mother.

3. Mother’s blood enters the foetal circulation,

agglutinating the RBCs, leading to its death.

4. The child’s blood enters mother’s circulation

and destroys her RBCs, leading to jaundice.

27. A reciprocal cross means:

1. F1 organism is back crossed to dominant

parent

2. F1 organism is back crossed to recessive

parent

3. cross between two homozygous organisms

4. interchanging sexes of 2 parents and

crossing

28. Antibodies are carried in:

1. The plasma

2. white blood cell

3. red blood corpuscle

4. platelet

29. In some females one of the X chromosomes

disintegrates and they possess 44 autosomes and

only one X chromosome. This disorder is known

as:

1. Cri du chat syndrome

2. Turner’s syndrome

3. Down’s syndrome

4. Klinefelter’s syndrome

30. This allosomal disorder is exclusively found

in males:

1. Cri du chat syndrome

2. Klinefelter’s syndrome

3. Down’s syndrome

4. Turner’s syndrome

31. In sickle cell anaemia the abnormal hemo-

globin is called:

1. Hemocyanin

2. Hemoglobin A

3. Hemoglobin S

4. Hemoerythrin

32. According to Mendel, in a cross involving a

pair of alleles,

1. both alleles blend & express together in the F1

generation.

2. Both alleles come and stay together but do not

blend.

3. Any one allele enters the F1 organism.

4. Both alleles disappear in the F1 generation.

33. More men suffer from colourblindness than

women because:

1. Women are more resistant than men

2. Men are hemizygous & one defective gene is

enough for them to suffer

3. Male hormones are responsible for colour-

blindness

4. The disease is Y-linked and is transmitted

only among males

34. This is not a valid reason for Mendel to select

pea plants for his experiments:

1. The flowers of pea plants are unisexual.

2. Pea plants possess contrasting traits.

3. Cross pollination by insects is impossible.

4. Life span of pea plants is reasonably short.

35. The appearance of an organism is known as:

1. Phenocopy

2. Genotype

3. Replication

4. Phenotype

36. If reciprocal crosses do not yield identical

results it means that:

1. There is incomplete dominance

2. Traits are not influenced by sex

3. There is no segregation of traits

4. The traits are sex-linked

37. With the knowledge of ABO blood groups it is

not possible to:

1. Make safe and success blood transfusions.

2. Assign a child to its rightful parents.

3. Determine the husband of an estranged wife.

4. Solve cases of disputed paternity.

38. The law of purity of gametes states that:

1. The gamete is pure for both alleles.

2. The parents are pure for a particular allele.

3. The F1 offspring are pure for both alleles.

4. The gamete is pure for a particular allele.

39. If the grandfather is colourblind, the

grandson becomes colourblind. But the daughter

is normal. This type of inheritance is said to be:

1. criss-cross inheritance

2. Holandric inheritance

3. Incomplete inheritance

4. Autosomal inheritance

40. Alleles are:

1. a pair of similar traits

2. a pair of dominant traits

3. a pair of recessive traits

4. a pair of contrasting traits

41. Down’s syndrome is an example of:

1. Autosomal disorder in man

2. Gene disorder in man

3. Allosomal disorder in man

4. Allelic disorder in man

42. Genotype means:

1. the genetic constitution of an organism

2. the appearance of an organism

3. the gametes produced by male parent

4. the gametes received by female parent

43. A cross involving two pairs of alleles is

known as:

1. test cross

2. back cross

3. dihybrid cross

4. Monohybrid cross

44. Mendel was lucky in selecting pea plants

for his experiments because:

1. Natural cross pollination of flowers

impossible.

2. Pea plants possess contrasting traits.

3. Pea plants have 7 pairs of chromosomes

and each chromosome carries one trait.

4. It is very easy to cultivate and grow pea

plants.

45. Which one of the following points played a

crucial role in Mendel’s success:

1. Mendel had a thorough knowledge of

Mathematics and Statistics.

2. Mendel was working as a monk in a church.

3. Mendel had no knowledge of genes or

chromosomes.

4. Mendel used to take special care in

cultivating pea plants.

46. Column 1 contains the names of organisms

and column 2 contains the concepts they reveal.

Match the two and select the correct answer:

1. 1-r, 2-p, 3-s, 4-q

2. 1-p, 2-q, 3-r, 4-s

3. 1-s, 2-r, 3-q, 4-p

4. 1-q, 2-s, 3-p, 4-r

1. Organisms 2. concepts

1. Mirabilis jalapa p. Sex linkage

2. Drosophila melanogaster q. Rh factor

3. Pisum sativum r. Incomplete dominance

4. Macaca rhesus s. Principles of heredity

47. Column 1 contains disorders and column 2

contains the reason for the same. Match the two

and select the correct answer given:

1. 1-s, 2-r, 3-q, 4-p

2. 1-p, 2-q, 3-s, 4-r

3. 1-s, 2-r, 3-p, 4-q

4. 1-r, 2-p, 3-q, 4-s

1. Disorder 2. Reason

1. Sickle cell anaemia p. Sex-linked hereditary disorder

2. Down’s syndrome q. One X chromosome is missing

3. Haemophilia r. One autosome is found in triplicate

4. Turner’s syndrome s. A defective gene produces abnormal RBCs

48. A pea plant producing yellow round seeds is crossed

with a plant which produces green wrinkled seeds (yyrr).

The ratios of offspring produced are mentioned column 1

and the genotype of the dominant parent in column 2.

Match the 2 and select the correct answer:

1. 1-s, 2-r, 3-q,4-p

2. 1-p, 2-q, 3-r, 4-s

3. 1-r, 2-s, 3-p, 4-q

4. 1-q, 2-p, 3-s, 4-r

1. Ratios of offspring 2. Genotype of dominant parent

1. Only yellow round offspring p. YyRR

2. Yellow round : yellow wrinkled (1:1) q. YyRr

3. Yellow round : green round (1:1) r. YYRR

4. Yellow round : Yellow wrinkled : Green

round : green wrinkled (1:1:1:1)

s. YYRr

49. A test cross is conducted:

1. as a rapid method of purifying the stocks.

2. to know whether a trait assorts indepen-

dently or not.

3. to determine the genotype of an organism.

4. To know whether a trait dominates over its

allele or not.

50. Which of the following statements of Mendel

is universally true:

1. In a cross involving a pair of alleles one of

them dominates over the other.

2. Reciprocal crosses yield identical results.

3. In a cross involving a pair of alleles, both

alleles come and stay together in F1 but do

not blend.

4. Every trait has two alternatives or alleles.