Free Inheritance MCQs with Answers
1,238 Inheritance MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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Read the Inheritance notesFree MDCAT chapter notes with key terms1,238 questions · page 31 of 62
- A. Breed this fish with a redfish and check F1 generation
- B. Breed this fish with a redfish and check F2 generation
- C. Breed this fish with a brown fish and check F1 generation
- D. Breed this fish with a brown fish and check F2 generation
Explanation: To find out whether the given species is homozygous or heterozygous we should breed it with species having a recessive phenotype and check…
Correct answer: Breed this fish with a redfish and check F1 generation- A. Hemophilia
- B. Heart defects
- C. Tay-Sachs disease
- D. Cystic fibrosis
Explanation: This question is simply choosing the odd one out. Heart defects are not genetic.
Correct answer: Heart defects- A. One is homozygous dominant and the other has a dominant phenotype but has a mother with a recessive phenotype
- B. One is homozygous recessive and the other has a dominant phenotype but has a mother with a recessive phenotype.
- C. One is homozygous recessive and the other has a dominant phenotype but has a brother with a recessive phenotype.
- D. One is homozygous recessive and another has a recessive phenotype. but has a father with a dominant phenotype.
Explanation: All statements describing the children's genetic combination and phenotype are wrong except B and C.
Correct answer: One is homozygous recessive and the other has a dominant phenotype but has a mother with a recessive phenotype.- A. Column A
- B. Column C
- C. Row B
- D. Row C
Explanation: C can be eliminated first because human skin color is determined by more than one gene.
Correct answer: Column C- A. Dominant
- B. Codominant
- C. Pleiotropic
- D. Recessive
Explanation: Haemophilia is a sex-linked recessive disorder. The abnormal gene responsible for haemophilia is carried on the X chromosome.
Correct answer: Recessive- A. 100%
- B. 50%
- C. 25%
- D. 0%
Explanation: Tabby cats are hybrids (because they have both colours) & a black cat must be homozygous black.
Correct answer: 0%- A. A,O
- B. O,A
- C. B,O
- D. B,A
Explanation: The father can pass on either the A or B allele to each of his offspring.
Correct answer: O,A- A. Epistasis
- B. Multiple alleles
- C. Codominance
- D. Pleiotropy
Explanation: Pleiotropy occurs when one gene influences two or more seemingly unrelated phenotypic traits.
Correct answer: Pleiotropy- A. All her children
- B. All her daughters
- C. Half of her daughters
- D. None of above
Explanation: When a carrier hemophiliac woman marries a normal man, there is a 50% chance that the male offsprings will be hemophiliac, which is not in…
Correct answer: None of above- A. Hemophilia
- B. Sickle cell Anemia
- C. Diabetes
- D. Hypophosphatemic rickets
- E. Testicular feminization syndrome
Explanation: Hemophilia is an X-linked recessive disorder that affects blood clotting.
Correct answer: Hemophilia- A. 25%
- B. 50%
- C. 75%
- D. 100%
Explanation: Color blindness is a sex-linked genetic disorder carried on the X chromosome.
Correct answer: 100%- A. Dominant
- B. Recessive
- C. Homozygous
- D. Heterozygous
- E. Linked
Explanation: In genetics, a dominant allele is expressed when present in either the homozygous or heterozygous state.
Correct answer: Dominant- A. Any Dominant trait
- B. Homozygous dominant trait
- C. Homozygous Recessive trait
- D. Heterozygous dominant trait
- E. A self-cross
Explanation: By crossing an individual showing a dominant trait with a homozygous recessive individual, we can determine the genotype of the dominant…
Correct answer: Homozygous Recessive trait- A. 3:1
- B. 1:1
- C. 2:1
- D. 1:1:2
- E. 1:2:1
Explanation: When a round-seeded plant (RR) is crossed with a wrinkled-seeded plant (rr), the F1 generation will be Rr, with a genotype of one dominant…
Correct answer: 1:2:1- A. 9:3:3:1
- B. 9:4:3:2
- C. 3:9:3:1
- D. 8:3:3:2
- E. 9:1:3:3
Explanation: This question is based on Mendelian genetics and the law of segregation.
Correct answer: 9:3:3:1- A. His mother's blood group is BB
- B. His mother's blood group is BO
- C. His father's blood group is AO
- D. His father's blood group is AA
Explanation: If a man has a B+ (B positive) blood group, the following statements cannot be true: 1.
Correct answer: His father's blood group is AA- A. 0 % yellow, 100 % green
- B. 25 % yellow, 75 % green
- C. 50 % yellow, 50 % green
- D. 75 % yellow, 25 % green
Explanation: As this is a test cross, we must breed the heterozygous subject with a homozygous recessive plant.
Correct answer: 50 % yellow, 50 % green- A. Dominance
- B. Multiple Alleles
- C. Pleitropy
- D. Epistasis
Explanation: Epistasis is when a gene at one locus alters the phenotypic expression of a gene at a second locus.
Correct answer: Epistasis619. When a gene suppresses the effect of another gene at another locus the phenomenon is termed as:
- A. Over dominance
- B. Pleiotropy
- C. Epistasis
- D. Codominance
Explanation: Epistasis is the phenomenon when one gene locus modifies or influences a phenotype of another gene locus.
Correct answer: Epistasis- A. Epistasis
- B. Pleiotropy
- C. Dominance relation
- D. Polygenes
Explanation: Pleiotropy occurs when one gene influences two or more seemingly unrelated phenotypic traits.
Correct answer: Pleiotropy