Inheritance Mdcat Mcqs
MDCAT Important MCQs (Inheritance)
Mendel’s Laws
1. Mendel’s law of segregation states that:
A) Genes blend
B) Alleles separate during gamete formation
C) Genes mutate
D) Traits are linked
Answer: B
2. Law of independent assortment is valid when genes are:
A) Linked
B) On same chromosome
C) On different chromosomes
D) Dominant
Answer: C
3. The genotypic ratio of a monohybrid cross (F₂) is:
A) 3:1
B) 1:2:1
C) 9:3:3:1
D) 2:1
Answer: B
4. Test cross is used to determine:
A) Phenotype
B) Genotype
C) Mutation
D) Linkage
Answer: B
5. A dihybrid cross produces how many gamete types?
A) 2
B) 4
C) 8
D) 16
Answer: B
6. Back cross is a cross between:
A) F₁ × recessive parent
B) F₁ × dominant parent
C) F₁ × F₁
D) Parent × parent
Answer: A
7. Phenotypic ratio 9:3:3:1 indicates:
A) Linkage
B) Independent assortment
C) Mutation
D) Codominance
Answer: B
Gene Linkage & Crossing Over
8. Linked genes are located on:
A) Different chromosomes
B) Same chromosome
C) Ribosomes
D) Cytoplasm
Answer: B
9. Linkage was discovered by:
A) Mendel
B) Thomas Hunt Morgan
C) Darwin
D) Watson
Answer: B
10. Crossing over occurs during:
A) Prophase I
B) Metaphase I
C) Anaphase I
D) Telophase
Answer: A
11. Crossing over results in:
A) Identical chromosomes
B) Genetic recombination
C) Mutation only
D) No variation
Answer: B
12. The frequency of crossing over depends on:
A) Gene size
B) Distance between genes
C) Cell type
D) Environment
Answer: B
13. Complete linkage produces phenotypic ratio:
A) 1:1
B) 3:1
C) 9:3:3:1
D) 1:2:1
Answer: A
14. Recombination frequency is measured in:
A) Joules
B) Meters
C) Percentage
D) Seconds
Answer: C
X-Linked Recessive Inheritance
15. X-linked recessive traits are more common in:
A) Females
B) Males
C) Both equally
D) Plants only
Answer: B
16. Example of X-linked recessive disorder:
A) Hypertension
B) Hemophilia
C) Diabetes
D) Cancer
Answer: B
17. A carrier female has genotype:
A) XX
B) XᴴXʰ
C) XʰXʰ
D) XY
Answer: B
18. Affected male genotype is:
A) XX
B) XY
C) XʰY
D) XᴴXᴴ
Answer: C
19. Father cannot pass X-linked trait to:
A) Son
B) Daughter
C) Both
D) None
Answer: A
20. If carrier mother × normal father, affected sons =
A) 0%
B) 25%
C) 50%
D) 100%
Answer: C
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