Biology Inheritance Test Online MCQs

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Question 1

1. What does a test cross help determine?

Answer

The presence of recessive traits only

Answer

The number of chromosomes

Answer

The blood group

Answer

Whether an individual is heterozygous or homozygous dominant

Question 2

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

Answer

50% tall, 50% short

Answer

All medium

Question 3

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

Answer

Inherited traits appear together

Answer

Traits assort independently

Answer

Greater genetic variation

Answer

Random recombination

Question 4

4. In which sex is hemophilia most commonly expressed?

Answer

Only children

Answer

Both equally

Question 5

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

Question 6

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

Question 7

7. What does the Law of Independent Assortment explain?

Answer

Each pair of alleles segregates independently during gamete formation

Answer

Dominant traits hide recessive ones

Answer

Mutations occur randomly

Answer

Alleles always segregate together

Question 8

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

Question 9

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

Answer

Height and seed shape in pea plants

Answer

Flower color in pea plants

Answer

Blood type in humans

Answer

Height in pea plants

Question 10

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

Question 11

11. Sex-linked genes are mostly located on:

Answer

Mitochondrial DNA

Answer

Y chromosome

Answer

X chromosome

Question 12

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

Answer

Wrinkled seeds

Answer

Short stem

Answer

White flower

Question 13

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

Answer

Medium height

Question 14

14. 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 15

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

Answer

Fathers only pass the Y chromosome to sons

Answer

Sons don’t have X chromosomes

Answer

Sons reject X chromosomes

Answer

Fathers don’t carry defective genes

Question 16

16. Which of the following is a test cross?

Question 17

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

Answer

Linked genes

Answer

Recessive genes

Answer

Codominant genes

Question 18

18. What does heterozygous mean?

Answer

Having different alleles

Answer

Having two identical alleles

Answer

Having one allele

Answer

Having a dominant trait only

Question 19

19. Which of the following best defines crossing over?

Answer

Segregation of alleles during mitosis

Answer

Exchange of segments between non-sister chromatids of homologous chromosomes

Answer

Exchange of genetic material between sister chromatids

Answer

Random mutation of DNA

Question 20

20. Gene linkage occurs when:

Answer

Genes are silenced

Answer

Genes are located close together on the same chromosome

Answer

Genes code for the same protein

Answer

Genes are located on different chromosomes

Question 21

21. Hemophilia primarily affects:

Answer

Nerve function

Answer

Digestive system

Answer

Blood clotting

Answer

Muscle strength

Question 22

22. Which process leads to genetic recombination?

Answer

Translation

Answer

Crossing over

Answer

Replication

Question 23

23. Which phase of meiosis does crossing over occur?

Answer

Metaphase I

Answer

Telophase I

Answer

Anaphase II

Answer

Prophase I

Question 24

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

Answer

Heterozygous

Answer

Homozygous

Question 25

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

Answer

Has no effect

Answer

May separate them, increasing variation

Answer

Ensures they always remain linked

Answer

Prevents their expression

Question 26

26. What process can separate linked genes?

Answer

Translation

Answer

Crossing over

Answer

Transcription

Answer

Replication

Question 27

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

Question 28

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

Answer

Nucleotides

Answer

Chromatids

Question 29

29. The units of inheritance are:

Answer

Chromosomes

Question 30

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

Answer

Traits are inherited in pairs

Answer

Dominant traits are always expressed

Answer

Alleles for a trait separate during gamete formation

Answer

Genes always blend in offspring

Question 31

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

Answer

TtRr × TtRr

Question 32

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

Question 33

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

Answer

Both males and females

Answer

Only males

Answer

Only females

Question 34

34. A recessive allele is expressed only when:

Answer

It is dominant over another allele

Answer

It is on a heterozygous genotype

Answer

It is present on both homologous chromosomes

Answer

It is present on a Y chromosome

Question 35

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

Answer

Hemophilia

Answer

Sickle-cell anemia

Question 36

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

Answer

Normal mother

Answer

Carrier father

Answer

Carrier mother

Answer

Affected father

Question 37

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

Question 38

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

Answer

Crossing over

Answer

Gene linkage

Answer

Codominance

Question 39

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

Question 40

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

Answer

Males are more prone to mutations

Answer

Males have two X chromosomes

Answer

Males have only one X chromosome

Answer

Y chromosome protects them

Question 41

41. In hemophilia, a female must inherit:

Answer

One defective Y

Answer

Two defective X chromosomes

Answer

One defective X

Answer

One defective autosome

Question 42

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

Question 43

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

Question 44

44. What is the purpose of a Punnett square?

Answer

To identify dominant alleles

Answer

To determine the age of a gene

Answer

To predict the probability of genetic traits

Answer

To study chromosomes under a microscope

Question 45

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

Question 46

46. A male inherits his X chromosome from:

Answer

His mother

Answer

Both parents

Answer

Only from autosomes

Answer

His father

Question 47

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

Question 48

48. What is the significance of independent assortment?

Answer

It maintains genetic stability

Answer

It increases genetic variation

Answer

It ensures mutation

Answer

It increases the number of cells

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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Biology Inheritance Test Online MCQs

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