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.
Last updated
Read the Inheritance notesFree MDCAT chapter notes with key terms1,238 questions · page 58 of 62
- A. Sister chromatids of homologous chromosomes
- B. Non-sister chromatids of homologous chromosomes
- C. Non-sister chromatids of non-homologous chromosomes
- D. Sister chromatids of non-homologous chromosomes
Explanation: The correct answer is B. During meiosis, homologous chromosomes undergo a process called synapsis, where they align closely.
Correct answer: Non-sister chromatids of homologous chromosomes- A. Hemophilia
- B. Color blindness
- C. Phenylketonuria (PKU)
- D. Epilepsy
Explanation: Epilepsy is identified as a neurological disorder characterized by recurrent seizures and is not classified solely as a genetic disorder…
Correct answer: Epilepsy- A. Homozygous and tall heighted
- B. Heterozygous and tall heighted
- C. Homozygous and short heighted
- D. Heterozygous and short heighted
Explanation: Mendel's law of segregation states that alleles separate during gamete formation, and each gamete carries only one allele for each trait.
Correct answer: Heterozygous and tall heighted- A. Option A: Both parents have genotype 'AO'
- B. Option B: Both parents have genotype 'BO'
- C. Option C: Both parents have genotype 'AB'
- D. Option D: Both parents have genotype 'OO'
Explanation: Parents with the genotype 'OO' can only have children with blood group O, as the 'O' allele is recessive.
Correct answer: Option D: Both parents have genotype 'OO'1145. Gene linkage is:
- A. Physical association of genes on a chromosome
- B. Physiological association of genes
- C. Both physical and physiological associations
- D. Neither physical nor physiological associations
Explanation: The correct answer is Option A: Physical association of genes on a chromosome.
Correct answer: Physical association of genes on a chromosome- A. Colour blindness
- B. TFM (Testicular Feminization)
- C. Haemophilia
- D. Leukemia
Explanation: The correct option is D) Leukemia. Leukemia is a form of cancer affecting blood and bone marrow, resulting from genetic mutations not…
Correct answer: Leukemia1147. Variation may be due to:
- A. Mutation
- B. Genetic recombination during gametogenesis
- C. Gene flow
- D. All A, B, C
Explanation: The correct answer is D: All A, B, C. Each of these processes plays a role in genetic variation. Mutation introduces new genetic variants.
Correct answer: All A, B, C- A. A reduction of blood clotting factors
- B. A malfunction of blood clotting factors
- C. A complete absence of blood clotting factors
- D. A reduction in hemopoietic stem cells
Explanation: The correct answer is Option D: A reduction in hemopoietic stem cells. Hemophilia is specifically related to deficiencies or malfunctions…
Correct answer: A reduction in hemopoietic stem cells1149. Red blindness is called:
- A. Protanopia
- B. Tritanopia
- C. Dichromacy
Explanation: The correct answer is Protanopia. This condition is a severe form of red-green color blindness where individuals cannot perceive red light…
Correct answer: Protanopia- A. Female genitalia
- B. No breast development
- C. Blind vagina
- D. Degenerated testes
Explanation: The correct answer is Option B: No breast development. Individuals with testicular feminization syndrome usually develop breasts due to…
Correct answer: No breast development- A. Dietary rickets
- B. Hypophosphatemic rickets
- C. Osteomalacia
- D. General bone weakness
Explanation: The correct answer is Hypophosphatemic rickets. This condition is not resolved by vitamin D supplementation because it stems from a…
Correct answer: Hypophosphatemic rickets- A. X-linked recessive traits
- B. Y-linked traits
- C. X-linked dominant traits
- D. X-linked traits
Explanation: The correct answer is Y-linked traits. This is because Y-linked traits are located on the Y chromosome, which only males possess.
Correct answer: Y-linked traits- A. A: 3/16
- B. B: 1/16
- C. C: 9/16
- D. D: 6/16
Explanation: The expected phenotypic ratio in the F2 generation of a dihybrid cross (AaBb x AaBb) is 9:3:3:1, indicating that there are three different…
Correct answer: D: 6/16- A. Sixteen years after his death
- B. Twenty years after his death
- C. Twenty-four years after his death
- D. Thirty-four years after his death
Explanation: In 1900, 16 years after Mendel's death, three botanists-Carl Correns, Hugo de Vries, and Erich von Tschermak-independently rediscovered…
Correct answer: Sixteen years after his death- A. Mouse and Rabbit
- B. Dog and Sheep
- C. Donkey and Horse
- D. Mouse, rabbit, dog, sheep, donkey, cattle, kangaroo, and chimpanzee
Explanation: The correct answer is the option that lists mouse, rabbit, dog, sheep, donkey, cattle, kangaroo, and chimpanzee.
Correct answer: Mouse, rabbit, dog, sheep, donkey, cattle, kangaroo, and chimpanzee1156. A phenomenon of gene interaction in which a gene interferes in the effect of another gene is called:
- A. Pleiotropy
- B. Epistasis
- C. Overdominance
- D. Co-dominance
Explanation: The correct answer is epistasis. Epistasis is a genetic phenomenon where the effect of one gene (the epistatic gene) interferes with or…
Correct answer: Epistasis- A. Different alleles of the same gene
- B. Different genes occupying different loci
- C. Same gene of different loci
- D. Different genes occupying the same locus
Explanation: Epistasis is an interaction between different genes at different loci, where one gene (epistatic) can modify or mask the expression of…
Correct answer: Different genes occupying different loci- A. IAIB
- B. IBi
- C. IAIA or IAi
- D. ii
Explanation: The genotype IAIA is homozygous for allele IA, which produces phenotype A.
Correct answer: IAIA or IAi- A. Puberty
- B. Old age
- C. Death
- D. Eighties
Explanation: The blood group alleles start expressing themselves during the early embryonic stage and continue to express throughout an individual's…
Correct answer: Death- A. Does not cause agglutination in the recipient
- B. Causes agglutination in the recipient
- C. Does not cause agglutination in the donor
- D. Causes agglutination in the donor
Explanation: The correct answer is that a safe blood transfusion does not cause agglutination in the recipient.
Correct answer: Does not cause agglutination in the recipient