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 33 of 62
- A. When genes are linked and their loci are close to each other
- B. When some genes have mutated on the chromosome
- C. When there are too many genes on a chromosome
- D. When genes are not linked and their loci are far apart
Explanation: The correct answer is Option A. Genes that are close together on the same chromosome are linked and tend to be inherited together because…
Correct answer: When genes are linked and their loci are close to each other- 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 B+ (B positive) blood group, the following statements cannot be true: 1.
Correct answer: His father's blood group is AA- A. Phenylketonuria
- B. Colour Blindness
- C. Sickle Cell Anaemia
- D. Blood Groups
Explanation: The correct option is d) Blood Groups. The ABO blood group system is controlled by multiple alleles: A, B, and O.
Correct answer: Blood Groups- A. Recessive parent
- B. Dominant parent
- C. Indifferent
- D. Half dominant & recessive
Explanation: Dominant parent is correct. When Mendel crossed two contrasting homozygous individuals, all the offsprings of G1 generation were of…
Correct answer: Dominant parent- A. Yellow/Round- 3/16
- B. Yellow/Wrinkled-3/16
- C. Green/Round-3/16
- D. Green/Wrinkled 1/16
Explanation: In a dihybrid cross between Pisum sativum plants with Yellow/Round seeds (YyRr) and Green/Wrinkled seeds (yyrr), the F2 generation will…
Correct answer: Yellow/Round- 3/16- A. 09/16
- B. 03/16
- C. 1/16
- D. 3/16 & 3/16
Explanation: 3/16 & 3/16 is correct. As round green and yellow wrinkled are recombinant types and are not parental types.
Correct answer: 3/16 & 3/16- A. Codominance
- B. Incomplete dominance
- C. Continuous variation
- D. Discontinuous variation
Explanation: Continuous variation is correct. Polygenic inheritance forms the basis of continuous variations. STB Pg 193.
Correct answer: Continuous variation- A. Blood Group 'A-1.00, Blood Group 'O'-0.00
- B. Blood Group 'A'-0.75, Blood Group 'O'-0.25
- C. Blood Group 'A-0.50, Blood Group 'O'-0.50
- D. Group 'A- 0.25, Blood Group 'O'-0.75
Explanation: The cross between I^A i and I^A i will produce 3 offsprings with blood group A and one offspring with blood group O.
Correct answer: Blood Group 'A'-0.75, Blood Group 'O'-0.25- A. Linnaeus
- B. Lamarck
- C. Darwin
- D. Hardy Weinberg
Explanation: The Hardy-Weinberg equilibrium is a fundamental concept in population genetics, and it provides a formula for calculating the frequencies…
Correct answer: Hardy Weinberg- A. Chromosome mutation
- B. Gene mutation
- C. Chromosomal aberrations
- D. Recombination
Explanation: A gene mutation involves alterations in the DNA sequence, leading to changes in the gene's expression.
Correct answer: Gene mutation- A. The ABO blood group system
- B. Cystic firbrosis
- C. Down's syndrome
- D. Haemophilia
Explanation: The ABO blood group system is controlled by multiple alleles on autosomal chromosomes, resulting in different blood types.
Correct answer: The ABO blood group system- A. All red eyed males and females
- B. Red eyed females and white eyed males
- C. White eyed females and red eyed males
- D. All white eyed females and males
Explanation: In Drosophila melanogaster, the gene for eye color is located on the X chromosome, and the white-eyed trait is a recessive mutation.
Correct answer: All red eyed males and females- A. Haemophilia
- B. Color blindness
- C. Hypophosphatemic rickets
- D. Becker muscular dystrophy
Explanation: Hypophosphatemic rickets is an X-linked dominant disorder. X-linked dominant disorders are genetic conditions caused by mutations in genes…
Correct answer: Hypophosphatemic rickets- A. Polygenic Inheritance
- B. Multiple Alleles
- C. Operons
- D. Allelic interaction
Explanation: In the ABO blood group system, there are more than two alleles (A, B, and O) that control the blood type in a population.
Correct answer: Multiple Alleles- A. F1
- B. F2
- C. F3
- D. P1
Explanation: F1: Correct, as the F1 generation refers to the first filial generation produced by crossing two parents.
Correct answer: F1- A. Same chromatids
- B. Same chromosomes
- C. Non -homologous chromosomes
- D. Homologous chromosomes
Explanation: Independent assortment refers to the random assortment of genes located on different chromosomes during meiosis.
Correct answer: Non -homologous chromosomes- A. Medicago sativa
- B. Piscum Sativum
- C. Delonicx regia
- D. Lens Culinaris
Explanation: Option B is coorect.G.J Mendel chose Pisum sativum, the garden pea plant, as an experimental plant for his study.Mendel chose pea plants…
Correct answer: Piscum Sativum- A. 18
- B. 9
- C. 3
- D. 1
Explanation: Option A is correct.When a round and yellow seeded plant (RrYy) is self-crossed, the expected phenotypic ratio of the offspring is…
Correct answer: 18- A. Prophase meiosis I
- B. Prophase meiosis II
- C. Metaphase of meiosis I
- D. Anaphase meiosis II
Explanation: Option A is correct. Crossing over occurs during prophase I of meiosis I, when homologous chromosomes pair up and exchange segments of…
Correct answer: Prophase meiosis I- A. House fly
- B. Fruit fly
- C. Flash fly
- D. Sand fly
Explanation: Option B is correct.Drosophila Melanogaster is the scientific name of the fruit fly.
Correct answer: Fruit fly