MDCAT XII Biology Genetics Online Test-2

Instructions for MDCAT XII Biology Genetics Online Test-2:

Most Important: Please wait a few seconds after clicking the see results/ test submit button. Don’t double-click or refresh the page.
Open in Chrome browser (recommended)
Don’t refresh the page during the test
This free online test will remain open for the whole mdcat session.
Your score will be shown on the screen after you submit the test
You can attempt the test anytime, anywhere
Join our WhatsApp Group: Click here
For Any Information, contact us via our Facebook Page

Test Details:

Subject: Biology
Class: 2nd year or 12
Chapter Name: Genetics
Test: MDCAT 2025
Book: Sindh Textbook
Total No. Of MCQS: 50 MCQS
Time Allowed: 50 Minutes
Price: Free

Created on April 10, 2025 By

medicoengineer.com

MDCAT XII Biology Genetics Online Test-2

Advertisements

Please Note: If You think the question is wrong or mistyped, the Question Key is wrong or out of syllabus, Feel free to comment or Contact with our team, our team will verify the question. For Contact details Please Visit the Contact Us page or email us at Contact@medicoengineer.com .

If you have any suggestion about our free test series you are also welcome to contact with us , we will appreciate you.

Best Of luck MDCAT Aspirants.

NameEmailPhone Number

1 / 56

1. A man with blood group A marries a woman with blood group O; which blood group is impossible in their children?

a) Blood group B

b) Blood group AB

c) Blood group B and blood group AB

d) All of above groups are possible

2 / 56

2. If the mother has blood type A and the child has blood group O, the father could not be:

a) Heterozygous A

b) Heterozygous B

c) AB

d) Cant be determined

3 / 56

3. A person with blood group B has two children. One child has Blood type A, and the other child has blood group. What is the genotype of mother?

a) IA IB

b) IA i

c) IB i

d) IA IA

4 / 56

4. When an IA IA male and an IA i female are married what are the expected frequencies of blood group in their children is___________.

a)
Blood group A=25%
Blood group B=25%
Blood group AB=25%
Blood group O=25%

b)
Blood group A=100%
Blood group B=0%
Blood group AB=0%
Blood group O=0%

c)
Blood group A=0%
Blood group B=50%
Blood group AB=50%
Blood group O=0%

d)
Blood group A=0%
Blood group B=50%
Blood group AB=0%
Blood group O=50%

5 / 56

5. The reason of Mendal success lied in his:

a) Choice of material

b) Method of study

c) Behavior

d) A and b

6 / 56

6. Mark the correct Pair:

a) Axial flower , recessive

b) Constricted pods , dominant

c) Yellow cotyledon, dominant

d) All are correct

7 / 56

7. It states that in a hybrid condition, only one character expresses completely while the other is masked completely.

a) Law of hybridization

b) Law of dominance

c) Law of recessive

d) Law of segregation

8 / 56

8. The Law of Segregation deals with the hybridization of how many traits?

a) 2

b) 4

c) 6

d) 1

9 / 56

9. This law states that factors of each trait segregate cleanly during the formation of gametes so that each gamete contains only one factor of a trait

a) Law of purity of gametes

b) Law of recessive

c) Law of dominance

d) Law of law of independent assortment

10 / 56

10. The Medalian term "trait" is for :

a) Genes

b) Character

c) Hybrid

d) Physical appearance

11 / 56

11. During single trait inheritance of plants of heterozygous genotype are self-pollinated the resulting dominant and recessive phenotypic ratio will be:

a) 1:1:2

b) 1:3

c) 1:1

d) 3:1

12 / 56

12. test cross is made between the phenotypically dominant individual and

a) Homozygous dominant

b) Heterozygous recessive

c) Homozygous recessive

d) Heterozygous dominant

13 / 56

13. Mendal was a/an:

a) Lawyer

b) Teacher

c) Doctor

d) Monk

14 / 56

14. The genotypic ratio of incomplete dominance of F2 generation is:

a) 3:1

b) 1:1

c) 1:2:1

d) 1:3

15 / 56

15. It is observed that when contrasting alleles exist in an individual, neither allele masks the expression of the other. Instead, their expressions blend to produce a new phenotype. Which of the following best describes this phenomenon?"

a) Partial dominance

b) Co dominance

c) Complete dominance

d) Test cross

16 / 56

16. It is observed that both contrasting alleles are dominant and express themselves in a heterozygous individual, without masking or blending the effects of one another. Which of the following best describes this phenomenon?

a) Partial dominance

b) Incomplete dominance

c) Co dominance

d) Complete dominance

17 / 56

17. There are ___ Phenotypes of MN blood group.

a) 2

b) 3

c) 6

d) 4

18 / 56

18. If a man with blood group M marries a woman with blood group N, all their children will have which of the following blood groups?

a) M group

b) N group

c) MN group

d) O group

19 / 56

19. In incomplete dominance, quantitatively:

a) Both express equally

b) Both express unequally

c) Only one express

d) Any of the above

20 / 56

20. The genes which have more than two alternative forms are called

a) Multiple cross

b) Test cross

c) Heterozygous allele

d) Multiple alleles

21 / 56

21. How many genotypic combinations of ABO blood group are there?

a) 7

b) 4

c) 3

d) 6

22 / 56

22. The Iᵃ and Iᵇ alleles are:

a) Co-dominant

b) Incompletely dominant

c) Recessive

d) Partially dominant

23 / 56

23. Different blood group systems are studied to explain:

a) Cell variability

b) Chemical properties

c) Interaction with other blood groups

d) All of the above

24 / 56

24. The Society of Blood Transfusion has identified more than ___ types of blood group systems:

a) 30

b) 60

c) 100

d) 13

25 / 56

25. Select the correct statement about a person’s blood group:

a) It changes continuously

b) It never changes

c) It changes only at birth

d) It depends on the person

26 / 56

26. The blood serum that contains antibodies is called:

a) Plasma

b) Body fluid

c) Blood serum

d) Antiserum

27 / 56

27. Some individuals have A and B antigens in their saliva and other body tissues. These individuals are called:

a) Special humans

b) Secretors

c) Excretors

d) Universal donors

28 / 56

28. The gene Se is located on chromosome number:

a) 46

b) 23

c) 19

d) 17

29 / 56

29. The universal donor blood group is:

a) O positive

b) AB positive

c) O negative

d) AB negative

30 / 56

30. Erythroblastosis fetalis is caused by Rh incompatibility when an Rh ___ woman marries an Rh ___ man:

a) Positive, Negative

b) Positive, Positive

c) Negative, Negative

d) Negative, Positive

31 / 56

31. Which of the following is not an example of qualitative inheritance?

a) Blood group

b) Rh factor

c) Tall or dwarf traits

d) None of the above

32 / 56

32. Genes that show additive effects to produce a variable phenotype are known as:

a) Inheritance genes

b) Polygenic inheritance

c) Multiple alleles

d) Partial dominance

33 / 56

33. Complexion, also known as skin color, is controlled by:

a) Three to six pairs of genes

b) Three to seven pairs of genes

c) Two pairs of genes

d) One to six pairs of genes

34 / 56

34. A gene that interferes with and masks the effect of a gene at another locus is called:

a) Epistatic

b) Interfering

c) Hypostatic

d) Both A and B

35 / 56

35. Linkage is the tendency of:

a) Chromosomes to be inherited together

b) Genes on different chromosomes to be inherited together

c) Genes on the same chromosome to be inherited together

d) Genes on autosomal chromosomes to link

36 / 56

36. In which type of linkage is the genetic ratio altered, with more parental types and fewer non-parental types?

a) Partial linkage

b) Complete linkage

c) Impartial linkage

d) Incomplete linkage

37 / 56

37. In the case of linked genes in a dihybrid cross, the result will be only parental combinations with a phenotypic ratio of:

a) 3:1

b) 1:2:1

c) 9:3:3:1

d) 12:3:1

38 / 56

38. Morgan, a contributor to the chromosomal theory of inheritance, studied how many pairs of contrasting traits in Drosophila?

a) 10

b) 85

c) 115

d) 2

39 / 56

39. Which of the following is/are correct regarding synapsis?

a) Pairing of homologous chromosomes

b) Occurs during meiosis II

c) Occurs during mitosis

d) All of the above

40 / 56

40. Which of the following is/are correct regarding crossing over?

a) Exchange of chromosomal segments

b) Occurs between homologous chromosomes

c) Occurs between non-sister chromatids

d) All of the above

41 / 56

41. W. Sutton found the simplest case of chromosomal difference in:

a) Grasshopper

b) Monkey

c) Bird

d) Drosophila

42 / 56

42. Which of the following is/are correct regarding the "black-bellied dew lover" (Drosophila)?

a) Males and females differ in one pair of chromosomes

b) Males have both sex chromosomes different from each other

c) The rod-shaped sex chromosomes—two in females and one in males—are designated as X chromosomes

d) All of the above

43 / 56

43. Which of the following statements is correct?

a) In humans, the male is heterogametic

b) In Drosophila, the female is homogametic

c) In grasshoppers, the male is heterogametic

d) All of the above

44 / 56

44. Which of the following is correct regarding Y-linked traits?

a) Also called holandric traits

b) Expressed phenotypically in males

c) Are hemizygous

d) All of the above

45 / 56

45. Genes that are present in both sexes but expressed only in one gender and suppressed in the other are called:

a) Sex-influenced traits

b) Sex-limited traits

c) Autosomal-influenced traits

d) Autosomal-limited traits

46 / 56

46. Which of the following are X-linked traits?

a) Color blindness

b) Muscular dystrophy

c) Hemophilia

d) All of the above

47 / 56

47. Which of the following is/are examples of X-linked dominant inheritance?

a) Vitamin D-resistant rickets

b) Hypophosphatemia

c) Rett syndrome

d) All of the above

48 / 56

48. Which of the following statements regarding haemophilia is/are correct?

a) The gene for haemophilia is inherited in a zig-zag pattern

b) It is more common in males due to hemizygosity

c) It is an X-linked recessive inheritance

d) All of the above

49 / 56

49. The gene responsible for blue opsins is located on chromosome number:

a) 7

b) 46

c) 44

d) 19

50 / 56

50. This type of color blindness allows a person to distinguish two colors but not the third:

a) Monochromacy

b) Trichromatic vision

c) Dichromacy

d) Normal

51 / 56

51. Protanopia is:

a) Red color blindness

b) Green color blindness

c) Blue color blindness

d) Black color blindness

52 / 56

52. Two parents with blood group A have a daughter with blood group O. What is the probability that their next child will be a boy with blood group O?

a) 0.25

b) 0.5

c) 0.75

d) 1

53 / 56

53. Which of the following would cause phenotypic variation among organisms with the same genotype?

a) Continuous variation within the species

b) Different varieties of the same species

c) Different sexes

d) Exposure to different environments

54 / 56

54. Which of the following statements about dystrophy is/are correct?

a) It is a type of muscle disease caused by a mutated allele

b) It is a sex-linked recessive disorder

c) It causes calcium leakage into the cells

d) All of the above

55 / 56

55. Which of the following are Y-linked traits in humans?

a) Porcupine man

b) Hypertrichosis (hair growth on the edges of the pinna)

c) Webbing of toes

d) All of the above

56 / 56

56. Which of the following statements is correct?

a) The gene for eye color in Drosophila is located on the X chromosome

b) X-Y linked traits are also known as pseudoautosomal traits

c) The bobbed gene in Drosophila is pseudoautosomal

d) All of the above

Your score is

Instructions for MDCAT XII Biology Genetics Online Test-2:

Test Details:

Related Posts