Biology Inheritance Test Online MCQs

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Question 1

1. If two carriers of a recessive disorder marry, what is the chance their child will be affected?

Question 2

2. A male inherits his X chromosome from:

Answer

His mother

Answer

His father

Answer

Both parents

Answer

Only from autosomes

Question 3

3. Which of the following diseases is caused by an X-linked recessive gene?

Answer

Sickle-cell anemia

Answer

Hemophilia

Question 4

4. Hemophilia primarily affects:

Answer

Muscle strength

Answer

Nerve function

Answer

Blood clotting

Answer

Digestive system

Question 5

5. Which of the following is an example of a dihybrid trait?

Answer

Flower color in pea plants

Answer

Blood type in humans

Answer

Height in pea plants

Answer

Height and seed shape in pea plants

Question 6

6. If T is dominant for tall and t for dwarf, what is the phenotype of Tt?

Answer

Medium height

Question 7

7. Which of the following best defines crossing over?

Answer

Random mutation of DNA

Answer

Exchange of genetic material between sister chromatids

Answer

Segregation of alleles during mitosis

Answer

Exchange of segments between non-sister chromatids of homologous chromosomes

Question 8

8. In which sex is hemophilia most commonly expressed?

Answer

Both equally

Answer

Only children

Question 9

9. In Mendel's dihybrid cross, what phenotypic ratio is expected in the F2 generation?

Question 10

10. What does a test cross help determine?

Answer

The number of chromosomes

Answer

Whether an individual is heterozygous or homozygous dominant

Answer

The blood group

Answer

The presence of recessive traits only

Question 11

11. A recessive allele is expressed only when:

Answer

It is dominant over another allele

Answer

It is present on both homologous chromosomes

Answer

It is on a heterozygous genotype

Answer

It is present on a Y chromosome

Question 12

12. Which of the following is a test cross?

Question 13

13. Why are X-linked recessive traits more common in males?

Answer

Y chromosome protects them

Answer

Males have two X chromosomes

Answer

Males are more prone to mutations

Answer

Males have only one X chromosome

Question 14

14. In Mendel’s experiments, which trait was dominant?

Answer

White flower

Answer

Short stem

Answer

Wrinkled seeds

Question 15

15. Which term refers to different forms of a gene?

Answer

Chromatids

Answer

Nucleotides

Question 16

16. In X-linked inheritance, who can be carriers of the trait?

Answer

Only males

Answer

Only females

Answer

Both males and females

Question 17

17. Which term describes genes located on the same chromosome and inherited together?

Answer

Codominant genes

Answer

Linked genes

Answer

Recessive genes

Question 18

18. Which of the following crosses would show Mendel’s Law of Independent Assortment?

Answer

TtRr × TtRr

Question 19

19. In a Punnett square of an XʰX × XY cross, what is the chance of a daughter being a carrier?

Question 20

20. What process can separate linked genes?

Answer

Crossing over

Answer

Replication

Answer

Translation

Answer

Transcription

Question 21

21. Sex-linked genes are mostly located on:

Answer

Y chromosome

Answer

Mitochondrial DNA

Answer

X chromosome

Question 22

22. What is the effect of crossing over on linked genes?

Answer

Has no effect

Answer

Ensures they always remain linked

Answer

Prevents their expression

Answer

May separate them, increasing variation

Question 23

23. Which of the following is a result of gene linkage?

Answer

Inherited traits appear together

Answer

Traits assort independently

Answer

Random recombination

Answer

Greater genetic variation

Question 24

24. In hemophilia, a female must inherit:

Answer

One defective autosome

Answer

One defective Y

Answer

Two defective X chromosomes

Answer

One defective X

Question 25

25. How many alleles does a diploid organism have for each gene?

Question 26

26. Which of the following best describes Mendel's Law of Segregation?

Answer

Genes always blend in offspring

Answer

Alleles for a trait separate during gamete formation

Answer

Dominant traits are always expressed

Answer

Traits are inherited in pairs

Question 27

27. What does the Law of Independent Assortment explain?

Answer

Dominant traits hide recessive ones

Answer

Mutations occur randomly

Answer

Each pair of alleles segregates independently during gamete formation

Answer

Alleles always segregate together

Question 28

28. The units of inheritance are:

Answer

Chromosomes

Question 29

29. What is the significance of independent assortment?

Answer

It increases genetic variation

Answer

It increases the number of cells

Answer

It maintains genetic stability

Answer

It ensures mutation

Question 30

30. Which scientist is known as the father of genetics?

Question 31

31. What does heterozygous mean?

Answer

Having one allele

Answer

Having two identical alleles

Answer

Having different alleles

Answer

Having a dominant trait only

Question 32

32. Which of the following violates the law of independent assortment?

Answer

Codominance

Answer

Gene linkage

Answer

Crossing over

Question 33

33. What is the purpose of a Punnett square?

Answer

To predict the probability of genetic traits

Answer

To identify dominant alleles

Answer

To study chromosomes under a microscope

Answer

To determine the age of a gene

Question 34

34. Which of the following would have a 100% chance of passing on an X-linked recessive trait to daughters?

Answer

Affected father

Answer

Carrier father

Answer

Carrier mother

Answer

Normal mother

Question 35

35. A female with normal genes for clotting marries a hemophilic man. What is the chance their son will have hemophilia?

Question 36

36. Which process leads to genetic recombination?

Answer

Replication

Answer

Crossing over

Answer

Translation

Question 37

37. Why can’t fathers pass X-linked traits to sons?

Answer

Sons don’t have X chromosomes

Answer

Fathers don’t carry defective genes

Answer

Fathers only pass the Y chromosome to sons

Answer

Sons reject X chromosomes

Question 38

38. Which of the following terms best describes the physical appearance of an organism?

Question 39

39. What is the probability that a carrier mother and a normal father will have a son with hemophilia?

Question 40

40. Gene linkage occurs when:

Answer

Genes are located close together on the same chromosome

Answer

Genes are located on different chromosomes

Answer

Genes are silenced

Answer

Genes code for the same protein

Question 41

41. A hemophilic male and a carrier female have how many chances of passing on the disease?

Question 42

42. How many types of gametes can be produced by a heterozygous dihybrid individual (TtRr)?

Question 43

43. A carrier female for hemophilia would have the genotype:

Question 44

44. Which phase of meiosis does crossing over occur?

Answer

Prophase I

Answer

Metaphase I

Answer

Anaphase II

Answer

Telophase I

Question 45

45. What is the condition in which an individual has two identical alleles for a trait?

Answer

Homozygous

Answer

Heterozygous

Question 46

46. What is gene mapping based on?

Answer

Shape of DNA

Answer

Frequency of crossing over

Answer

Location of traits

Answer

Physical size of chromosomes

Question 47

47. What is the expected genotypic ratio of a monohybrid cross between two heterozygotes?

Question 48

48. What is the result of crossing TT (tall) with tt (short) pea plants?

Answer

All medium

Answer

50% tall, 50% short

Question 49

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Total Questions:	48
Time Allowed:	25 Minutes
Total Marks:	48
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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