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 19 of 62
- A. Test cross
- B. Monohybrid cross
- C. F1 cross
- D. Dihybrid cross
Explanation: The test cross is another fundamental tool devised by Gregor Mendel. In its simplest form, a test cross is an experimental cross of an…
Correct answer: Test cross- A. 3 : 1
- B. 1 : 2 : 1
- C. 9 : 3 : 3 : 1
- D. 9 : 3 : 2 : 1
Explanation: This 9:3:3:1 phenotypic ratio is the classic Mendelian ratio for a dihybrid cross in which the alleles of two different genes assort…
Correct answer: 9 : 3 : 3 : 1- A. Pleiotropy
- B. Epistasis
- C. Dominance
- D. Probability
Explanation: In genetics, probability is a measurement tool that helps us predict the chances of an offspring being inherited with a particular trait…
Correct answer: Probability- A. Dwarfism
- B. Gigantism
- C. Albinism
- D. Pigmentation
Explanation: Albinism is an inherited condition that leads to someone having very light skin, hair, and eyes.
Correct answer: Albinism- A. 25%
- B. 50%
- C. 75%
- D. 100%
Explanation: Since the parents are heterozygous and when Aa x Aa are crossed the results will be 1. AA, 2. Aa, 3. Aa, 4. aa.
Correct answer: 25%366. The physiological effect of an allele over its partner allele on the same gene locus is called:
- A. Dominance
- B. Epistasis
- C. Pleiotropy
- D. Bombay phenotype
Explanation: Dominance, in genetics, greater influence by one of a pair of genes (alleles) that affect the same inherited character.
Correct answer: Dominance- 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. Over dominance
- B. Codominance
- C. Complete dominance
- D. Partial 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. Multiple alleles
- B. Pseudoalleles
- C. Codominant alleles
- D. Dominant alleles
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: Codominant alleles- A. 0%
- B. 25%
- C. 50%
- D. 100%
Explanation: Since the gene of color-blindness is recessive the father genotype will be XcY and the mother is normal so her genotype will be XCXC.
Correct answer: 0%- A. Multiple alleles
- B. Pseudoalleles
- C. Codominant alleles
- D. Dominant alleles
Explanation: Multiple alleles can be defined as a series of forms of a gene situated at the same locus of homologous chromosomes.
Correct answer: Multiple alleles- A. One
- B. Two
- C. Three
- D. Four
Explanation: Three different gene pairs, i.e. Aa, Bb, and Cc at three different loci contribute to the wheat grain color.
Correct answer: Three- A. IA
- B. IB
- C. i
- D. a
Explanation: This is the allele for albinism and it does not have any alternate form which is the condition for multiple alleles.
Correct answer: a- A. A
- B. B
- C. AB
- D. O
Explanation: Since the person with blood group O does not have any antigen so they will have both anti-A and Anti-B antibodies
Correct answer: O- A. A
- B. B
- C. AB
- D. O
Explanation: Since a person with Ab blood has A and B antigens it does not have anti-A and anti-B antibodies.
Correct answer: AB- A. A
- B. B
- C. AB
- D. O
Explanation: O blood group can donate blood to all the the other blood groups so that it is called universal donor
Correct answer: O- A. A
- B. B
- C. AB
- D. O
Explanation: AB can only receive blood from all the other blood groups.
Correct answer: AB- A. 11
- B. 19
- C. 21
- D. 25
Explanation: ABH secretions are controlled by fucosyletransferase 2 (FUT2) secretor gene located on the short arm of chromosome number 19 in the form…
Correct answer: 19- A. New born
- B. Adult
- C. Monkey
- D. Cats
Explanation: Hemolytic disease of the newborn (HDN) - also called erythroblastosis fetalis - is a blood disorder that occurs when the blood types of a…
Correct answer: New born- A. Hemoglobin
- B. Bilirubin
- C. Insulin
- D. None of (A), (B), (C)
Explanation: Red blood cell hemoglobin molecules are broken down into two subunits, heme (the part containing iron) and globin.
Correct answer: Bilirubin