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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- A. 1857
- B. 1840
- C. 1865
- D. 1830
Explanation: Mendel's law of independent assortment states that the alleles of two (or more) different genes get sorted into gametes independent of one…
Correct answer: 1865- A. Heterozygous
- B. Hemizygous
- C. Homozygous
- D. None of these
Explanation: Eye color in Drosophila is an X-linked trait. This means that males have only one allele for the gene as they have only one X chromosome…
Correct answer: Hemizygous- A. Nettie Stevens
- B. T.H. Morgan
- C. Walter Sutton
- D. None
Explanation: T.H. Morgan conducted his famous experiments on Drosophila melanogaster and discovered the phenomenon of sex linkage.
Correct answer: T.H. Morgan- A. A only
- B. AB only
- C. B only
- D. A, B, AB, O
Explanation: Considering both the mother and father have heterozygous genotypes for B and A blood groups, respectively, their genotypes would thus be…
Correct answer: A, B, AB, O- A. Recessive
- B. Heterozygous
- C. Dominant
- D. Homologous
Explanation: A dominant allele is one that is fully expressed by masking the effects of the other alleles.
Correct answer: Dominant- A. Leukemia
- B. Colour blindness
- C. Alzheimer's
- D. Malignancy
Explanation: Colour blindness is an inherited sex-linked disorder. The gene for colour blindness is present on the X chromosome so it affects more men…
Correct answer: Colour blindness- A. X-chromosome
- B. None of these
- C. Y-chromosome
- D. Both X and Y chromosomes
Explanation: The gene for colour blindness is present on the X chromosome. As males have XY chromosomes, their X chromosome is inherited from their…
Correct answer: X-chromosome- A. Height
- B. Skin colour
- C. Hair colour
- D. Blood group
Explanation: Bombay phenotype is an example of epistasis. It is the rarest blood group involving the ABO blood group system, individuals with this…
Correct answer: Blood group- A. None of these
- B. Anti-A antibodies
- C. Anti-B antibodies
- D. Both anti-A and anti-B antibodies
Explanation: A person with blood group A will have A antigens on his RBCs but anti-B antibodies in his blood plasma.
Correct answer: Anti-A antibodies- A. Dominant trait carried by X-chromosome
- B. Recessive trait carried by Y-chromosome
- C. Dominant trait carried by Y-chromosome
- D. Recessive trait carried by X-chromosome
Explanation: Hemophilia A and B are rare X-linked recessive traits. Chances for a man to be affected by these are greater than those for a woman.
Correct answer: Recessive trait carried by X-chromosome- A. 0%
- B. 25%
- C. 50%
- D. 100%
Explanation: Color blindness is an X-linked recessive trait. Like any sex-linked recessive trait, it zigzags from maternal grandfather through a…
Correct answer: 0%- A. Three
- B. Two
- C. One
- D. Four
Explanation: The blood group system is encoded by a single polymorphic gene present on chromosome number 9.
Correct answer: Three- A. Advance gamete
- B. Null gamete
- C. Male gamete
- D. None
Explanation: A male gamete has 23 chromosomes with XY as the sex chromosome. A female gamete has 23 chromosomes with XX as the sex chromosome.
Correct answer: Null gamete- A. Hair color
- B. Eye color
- C. Number of limbs
- D. All of these
Explanation: Correct option is D. The correct answer is "all of these." Visible genetic traits include Hair color, Eye color, and Number of limbs.
Correct answer: All of these- A. Another unknown green pea
- B. Any genotype
- C. Homozygous dominant
- D. Homozygous recessive (cc) or known heterozygous (Cc)
Explanation: A green pea would definitely be homozygous recessive. A is the best option because if the unknown dominant individual is heterozygous…
Correct answer: Another unknown green pea- A. Half of the seeds will be yellow
- B. All of the the seeds will be green
- C. Both phenotypes will be present in a ratio of 1:2:1
- D. All the seeds will be yellow
Explanation: Option (d) suggests that all the seeds in the F1 generation will be yellow. This statement is correct.
Correct answer: All the seeds will be yellow- A. 16,777,216
- B. 2,0,48
- C. 4,194,304
- D. 8,388,608
Explanation: According to the law of independent assortment, there are 2n combinations where chromosomes can assort into different gametes.
Correct answer: 8,388,608- A. Codominant
- B. Epistatic
- C. Polygenes
- D. Pleiotropic
Explanation: Option A: Both alleles of a gene are expressed equally and independently in the 'Heterozygous' condition.
Correct answer: Polygenes- A. Complete dominance
- B. Over-dominance
- C. Codominance
- D. Incomplete dominance
Explanation: Codominance, as it relates to genetics, refers to a type of inheritance in which two versions (alleles) of the same gene are expressed…
Correct answer: Codominance- A. Colour of flower in pea plant
- B. Blood group of the human being
- C. Shape of seed in pea plant
- D. Length of stem in pea plant
Explanation: Multiple alleles are the alternative forms of the same gene so they influence the same trait.
Correct answer: Blood group of the human being