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. 9/16
- B. 3/16
- C. 1/16
- D. 2/16
Explanation: F1 plants gave F2 progenies exhibiting 4 different phenotypes: Round yellow (9), wrinkled yellow (3), round green (3), and wrinkled green…
Correct answer: 9/16- A. 9/16
- B. 3/16
- C. 1/16
- D. 2/16
Explanation: F1 plants gave F2 progenies exhibiting 4 different phenotypes: Round yellow (9), wrinkled yellow (3), round green (3), and wrinkled green…
Correct answer: 1/16- A. All albino
- B. 3 : 1
- C. 1 : 1
- D. All normal
Explanation: Albinism is autosomal recessive inheritance and not sex-linked so the ratio of albinism in their offspring will be equal and 1:1.
Correct answer: 1 : 1- A. Complete dominance
- B. Incomplete dominance
- C. Codominance
- D. Over-dominance
Explanation: The Carnation plant (which is an example of incomplete dominance) has true-breeding white flowers and true-breeding red flowers.
Correct answer: Incomplete dominance- A. 1 : 1
- B. 3 : 1
- C. 1 : 2 : 1
- D. 9 : 3 : 3 : 1
Explanation: F2 showed all three phenotypes of flowers in the ratio of 1 red: 2 pink: 1 white.
Correct answer: 1 : 2 : 1- A. Complete dominance
- B. Incomplete dominance
- C. Codominance
- D. Over 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. Over dominance
- B. Codominance
- C. Incomplete dominance
- D. Complete dominance
Explanation: An example of codominance is seen in the MN blood group system of humans. MN blood type is governed by two alleles, M and N.
Correct answer: Codominance- A. Carl Correns
- B. Landsteiner
- C. T.H. Morgan
- D. Bernstein
Explanation: After the discovery of the first blood group, ABO, in 1900, Landsteiner and his colleagues continued to experiment with blood to identify…
Correct answer: Landsteiner- A. Rh+ male Rh+ female
- B. Rh+ male Rh- female
- C. Rh- male, Rh- female
- D. Rh- male Rh+ female
Explanation: Erythroblastosis fetalis results from Rh(D) incompatibility, which may develop when a woman with Rh-negative blood is impregnated by a man…
Correct answer: Rh+ male Rh- female- A. Fever
- B. Heart problem
- C. Jaundice
- D. Death of baby
Explanation: Babies who experience erythroblastosis fetalis symptoms may appear swollen, pale, or jaundiced after birth.
Correct answer: Jaundice- A. 3 : 1
- B. 1 : 1
- C. 2 : 1
- D. All
Explanation: The risk of erythroblastosis fetalis, also known as hemolytic disease of the newborn, occurs when an Rh-negative mother carries an…
Correct answer: 1 : 1- A. Codominance
- B. Epistasis
- C. Pleiotropy
- D. Over dominance
Explanation: Epistasis is a circumstance where the expression of one gene is modified (e.g., masked, inhibited or suppressed) by the expression of one…
Correct answer: Epistasis- A. Codominance
- B. Pleiotropy
- C. Epistasis
- D. Over dominance
Explanation: Epistasis is a circumstance where the expression of one gene is modified (e.g., masked, inhibited or suppressed) by the expression of one…
Correct answer: Epistasis- A. A
- B. B
- C. AB
- D. O
Explanation: If the H gene is absent the child will have Bombay's phenotype in which the child will be phenotypically O but will genotypically either…
Correct answer: O- A. Codominance
- B. Pleiotropy
- C. Epistasis
- D. Over dominance
Explanation: "PLEIOTROPY" refers to the phenomenon in which a single locus affects two or more apparently unrelated phenotypic traits and is often…
Correct answer: Pleiotropy- A. Codominance
- B. Epistasis
- C. Pleiotropy
- D. Over dominance
Explanation: Cats with white fur and blue eyes are likely to be deaf. If a white cat has two different colored eyes, in which one eye is blue, it will…
Correct answer: Pleiotropy- A. Human height
- B. Human skin colour
- C. Red white flower
- D. Cornel colour in wheat
Explanation: These characters are either present or absent, showing no intermediate forms.
Correct answer: Red white flower- A. Human height
- B. Red white flower
- C. Human skin colour
- D. Cornel colour in wheat
Explanation: These characters are either present or absent, showing no intermediate forms.
Correct answer: Red white flower- A. Tall/dwarf
- B. Round/wrinkled
- C. Human height
- D. Diabetes
Explanation: A polygenic trait is a characteristic, such as height or skin color, that is influenced by two or more genes.
Correct answer: Human height- A. Carl Correns
- B. Nilsson Ehle
- C. T.H. Morgan
- D. Mendel
Explanation: Nilsson Ehle studied the genetics of wheat grain color.
Correct answer: Nilsson Ehle