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. 0.05
- B. 0.5
- C. 0.25
- D. 0.7
Explanation: In a Mendelian cross involving a heterozygous flower (say, Rr, where:R = dominant allele (e.g., red color)r = recessive allele (e.g.…
Correct answer: 0.25- A. Codominance
- B. Incomplete dominance
- C. Dominance
- D. Recessive
Explanation: This is the correct answer. Codominance occurs when both alleles of a heterozygous individual are expressed simultaneously in the…
Correct answer: Codominance- A. X linked recessive disorder
- B. X linked dominant disorder
- C. Y linked dominant disorder
- D. Y linked recessive disorder
Explanation: An X-linked dominant disorder is a genetic condition that is caused by a mutation in a gene located on the X chromosome.
Correct answer: X linked dominant disorder- A. Occurs when both father and mother are Rh +ive
- B. Occurs when both father and mother are Rh -ive
- C. Occurs when mother is Rh+ive and father is Rh -ive
- D. Occurs when mother is Rh-ive and father is Rh +ive
Explanation: Erythroblastosis fetalis (EF) is a condition that occurs when there is an incompatibility between the blood types of a mother and her…
Correct answer: Occurs when mother is Rh-ive and father is Rh +ive- A. Behaviour of chromosomes in mitosis
- B. Behaviour of chromosomes in meiosis
- C. Gene behaviour in mitosis
- D. Both a and b
Explanation: Mendel's law of independent assortment states that different genes are sorted independently of each other during gamete formation.
Correct answer: Behaviour of chromosomes in meiosis- A. Naturally before birth
- B. Naturally after birth
- C. After exposure to Rh antigen
- D. After exposure to Rh antibodies
Explanation: Rh antibodies are produced in Rh-negative (Rh-ve) individuals when they are exposed to Rh-positive (Rh+ve) blood, which contains the Rh…
Correct answer: After exposure to Rh antigen- A. Haemophilia A
- B. Haemophilia B
- C. Haemophilia C
- D. Haemophilia VII
Explanation: Haemophilia A, also known as classic haemophilia, is the most common type of haemophilia, accounting for about 80-85% of all haemophilia…
Correct answer: Haemophilia A- A. Same locus on same chromosome
- B. Different locus on same chromosomes
- C. Same locus on respective homologue
- D. Different locus on respective homologue
Explanation: Alleles are located at the same position on homologous chromosomes, and one may be dominant over the other.
Correct answer: Same locus on respective homologue- A. In ratio of 1:2
- B. In ratio of 1:1
- C. In ratio of 3:1
- D. In ratio of 1:3
Explanation: When heterozygous red-flowered F1 plants (Rr) self-pollinate, the F2 generation results in a 3 red : 1 white phenotypic ratio.
Correct answer: In ratio of 3:1- A. During early development
- B. During the first few months of life
- C. At the age of puberty
- D. When exposed to the wrong blood group
Explanation: During the first few months of life - Correct. Anti-A and anti-B antibodies begin to appear in an infant's blood plasma around 3-6 months…
Correct answer: During the first few months of life- A. Bernstein
- B. Mendel
- C. Landsteiner
- D. Levine
Explanation: Landsteiner - Correct. Karl Landsteiner discovered the ABO blood group system in 1901.
Correct answer: Landsteiner- A. Mitosis
- B. Cloning
- C. Gene linkage
- D. Crossing over
Explanation: Crossing over - Correct. Crossing over during meiosis exchanges genetic material between homologous chromosomes, leading to genetic…
Correct answer: Crossing over- A. Experimental Mating
- B. Chi-Square Chart
- C. Pedigree Analysis
- D. Probability Analysis
Explanation: Pedigree Analysis - Correct. Pedigree analysis tracks inheritance patterns through family generations.
Correct answer: Pedigree Analysis- A. Edible-pea
- B. Garden pea
- C. Bean plant
- D. Wild pea
- E. Pea nut
Explanation: Mendel selected garden peas for his experiment as they were easier to get and do an experiment. So Option B s the correct answer.
Correct answer: Garden pea- A. Linkage
- B. Mutation
- C. Crossing over
- D. Genome
- E. Gene pool
Explanation: The correct answer is b) Mutation. The white-eyed trait in Drosophila (fruit flies) is primarily due to a mutation.
Correct answer: Mutation- A. One single pair
- B. Seven pairs
- C. Three pairs
- D. Four pairs
- E. Two pairs
Explanation: As mentioned in STB , mendel selected seven pairs of contrasting character.
Correct answer: Seven pairs- A. Maternal-foetal incompatibility
- B. Paternal-foetal incompatibility
- C. Cancer of fetus
- D. Death of mother
Explanation: When an Rh-negative woman is married to an Rh-positive man and conceives a Rh-positive child, there can be a potential for maternal-fetal…
Correct answer: Maternal-foetal incompatibility- A. Experimental Mating
- B. Chi Square Chart
- C. Pedigree analysis
- D. Probability analysis
Explanation: Pedigree analysis is the most commonly used method to trace the mode of inheritance in humans.
Correct answer: Pedigree analysis- A. It could be group A only.
- B. It could be group AB only.
- C. It could be group A or group B only.
- D. It could be any of the groups A, B, AB and O.
Explanation: ABO blood group in humans is controlled by three different alleles IA, IB and i.
Correct answer: It could be any of the groups A, B, AB and O.- A. Red
- B. Green
- C. Grey
- D. Yellow
Explanation: Red-green colour blindness is the most common variety of colour deficiency in humans.
Correct answer: Grey