Inheritance Chapter top 30 most important and repeated MCQS for MDCAT 2026💯۔ Q.No 1: Mendel performed his experiments on: A) Maize B) Pea plant C) Drosophila D) Wheat Answer: B) Pea plant Q.No 2: The law of segregation is also called: A) First law of Mendel B) Second law of Mendel C) Third law of Mendel D) Law of linkage Answer: A) First law of Mendel Q.No 3: In a monohybrid cross, the phenotypic ratio in F₂ generation is: A) 1:2:1 B) 3:1 C) 9:3:3:1 D) 1:1 Answer: B) 3:1 Q.No 4: The genotypic ratio of monohybrid cross is: A) 3:1 B) 1:2:1 C) 9:3:3:1 D) 1:1 Answer: B) 1:2:1 Q.No 5: Mendel’s law of independent assortment applies to genes located on: A) Same chromosome B) Different chromosomes C) Mitochondria D) Ribosomes Answer: B) Different chromosomes Q.No 6: In a dihybrid cross, F₂ phenotypic ratio is: A) 1:2:1 B) 3:1 C) 9:3:3:1 D) 1:1:1:1 Answer: C) 9:3:3:1 Q.No 7: Test cross is used to determine: A) Dominant phenotype B) Unknown genotype C) Mutation rate D) Crossing over Answer: B) Unknown genotype Q.No 8: A heterozygous genotype is: A) AA B) aa C) Aa D) BB Answer: C) Aa Q.No 9: Alleles are: A) Different forms of same gene B) Chromosomes C) Proteins D) Traits Answer: A) Different forms of same gene Q.No 10: A recessive trait appears in: A) Homozygous dominant B) Heterozygous C) Homozygous recessive D) All individuals Answer: C) Homozygous recessive Q.No 11: The physical appearance of an organism is called: A) Genotype B) Phenotype C) Allele D) Locus Answer: B) Phenotype Q.No 12: The genetic makeup of an organism is: A) Phenotype B) Character C) Genotype D) Trait Answer: C) Genotype Q.No 13: Incomplete dominance shows: A) Only dominant trait B) Blending of traits C) Linked genes D) Mutation Answer: B) Blending of traits Q.No 14: Example of incomplete dominance: A) ABO blood group B) Snapdragon flower color C) Pea seed shape D) Hemophilia Answer: B) Snapdragon flower color Q.No 15: ABO blood group is an example of: A) Incomplete dominance B) Codominance C) Linkage D) Mutation Answer: B) Codominance Q.No 16: Universal donor blood group is: A) AB B) A C) O D) B Answer: C) O Q.No 17: Universal recipient blood group is: A) O B) A C) B D) AB Answer: D) AB Q.No 18: Hemophilia is: A) Autosomal disease B) Sex-linked recessive disease C) Dominant disease D) Polygenic disease Answer: B) Sex-linked recessive disease Q.No 19: Color blindness is carried on: A) Y chromosome B) X chromosome C) Autosome D) Mitochondria Answer: B) X chromosome Q.No 20: Crossing over occurs during: A) Prophase-I B) Metaphase-II C) Anaphase-I D) Telophase-II Answer: A) Prophase-I Q.No 21: The exchange of genes between homologous chromosomes is: A) Mutation B) Linkage C) Crossing over D) Segregation Answer: C) Crossing over Q.No 22: Polygenic inheritance controls: A) One trait by one gene B) One trait by many genes C) Many traits by one gene D) Mutation only Answer: B) One trait by many genes Q.No 23: Human skin color is an example of: A) Codominance B) Polygenic inheritance C) Linkage D) Mutation Answer: B) Polygenic inheritance Q.No 24: A carrier female for hemophilia has genotype: A) XᴴXᴴ B) XʰXʰ C) XᴴXʰ D) XʰY Answer: C) XᴴXʰ Q.No 25: The unit of inheritance is: A) Protein B) Chromosome C) Gene D) Nucleus Answer: C) Gene Q.No 26: Genes located on the same chromosome tend to be: A) Assorted independently B) Linked C) Mutated D) Dominant Answer: B) Linked Q.No 27: A mutation is: A) Normal replication B) Sudden heritable change C) Cell division D) Crossing over Answer: B) Sudden heritable change Q.No 28: Down syndrome occurs due to: A) Monosomy B) Trisomy 21 C) XO condition D) XXY condition Answer: B) Trisomy 21 Q.No 29: An individual with identical alleles is: A) Heterozygous B) Homozygous C) Hybrid D) Carrier Answer: B) Homozygous Q.No 30: Mendel’s experiments proved that inheritance is controlled by: A) Blending factors B) Particulate factors C) Cytoplasm D) Environment Answer: B) Particulate factors #mbbs___dreamer #mbbs___dreamer1 #mdcat #bravehairoil #fyp - @mbbs___dreamer1