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. Deletion
- B. Transfer of segments between X and Y chromosomes
- C. Aneuploidy
- D. Hormonal imbalance
Explanation: The correct answer is the 'Transfer of segments between X and Y chromosomes.' This rare genetic phenomenon involves the translocation of…
Correct answer: Transfer of segments between X and Y chromosomes- A. Rh ̄ female and Rh+ male
- B. Rh+ female and Rh ̄ male
- C. Rh+ female and Rh+ male
- D. Rh ̄ female and Rh ̄ male
Explanation: Erythroblastosis fetalis is caused by Rh incompatibility when an Rh-negative mother is exposed to Rh-positive fetal blood, leading to an…
Correct answer: Rh ̄ female and Rh+ male- A. 2 : 1
- B. 1 : 2 : 1
- C. 1 : 1
- D. 1 : 2
Explanation: The correct progeny ratio for the cross Tt x tt is 1:1. This means that half of the offspring will have the Tt genotype (heterozygous)…
Correct answer: 1 : 1- A. All haemophilic
- B. All boys haemophilic
- C. All girls haemophilic
- D. All normal
Explanation: In a marriage between a hemophilic man and a normal woman, all of their offspring will be normal.
Correct answer: All normal- A. He would not have discovered the law of independent assortment
- B. He would have discovered sex linkage
- C. He could have mapped the chromosome
- D. He would have discovered blending or incomplete dominance
Explanation: The law of independent assortment states that alleles of different genes assort independently of one another during gamete formation.
Correct answer: He would not have discovered the law of independent assortment- A. 50% haemophilic and colour-blind sons and 50% normal sons
- B. 50% haemophilic daughters (carrier) and 50% colour-blind daughters (carrier)
- C. All daughters carriers of haemophilia and colour blindness
- D. Haemophilic and colour-blind daughters
Explanation: The correct answer is that all daughters will be carriers of both haemophilia and colour blindness.
Correct answer: All daughters carriers of haemophilia and colour blindness- A. Gynandromorphism
- B. Klinefelter's syndrome
- C. Down's syndrome
- D. Turner's syndrome
Explanation: Klinefelter's syndrome, also known as XXY syndrome, is a condition where males have an extra X chromosome, leading to the karyotype 47…
Correct answer: Klinefelter's syndrome- A. Different karyotypes
- B. Different genotypes
- C. Different phenotypes
- D. None of these
Explanation: Polygenic inheritance involves the combined effect of multiple genes on a single trait, leading to continuous variation in the phenotype.
Correct answer: Different phenotypes- A. Edward's syndrome
- B. Klinefelter's syndrome
- C. Intersex
- D. Down's syndrome
Explanation: Klinefelter's syndrome is caused by the presence of an extra X chromosome in males (XXY).
Correct answer: Klinefelter's syndrome- A. Tyrosinase
- B. Xanthine oxidase
- C. Catalase
- D. Fructokinase
Explanation: Albinism is a genetic condition characterized by the absence of melanin, the pigment responsible for coloration in the skin, hair, and…
Correct answer: Tyrosinase- A. Mother's egg
- B. Father's sperm
- C. Both equally
- D. Random chance during zygote formation
Explanation: Egg always carries X, sperm carries either X or Y. Fertilization by X-bearing sperm = girl (XX), by Y-bearing sperm = boy (XY).
Correct answer: Father's sperm- A. Himself
- B. Herself
- C. Just
- D. To
Explanation: The error in the sentence is the use of "herself." It should be "her" instead.
Correct answer: Herself- A. Statement I is the cause and statement II is its effect
- B. Statement II is the cause and statement I is its effect
- C. Both statements I and II are independent causes
- D. Both statements I and II are effects of independent causes
Explanation: A major traffic incident like an overturned truck (Statement I) is a direct cause for the police to take action.
Correct answer: Statement I is the cause and statement II is its effect- A. Definitely true
- B. Probably true
- C. Data inadequate
- D. Probably false
- E. Definitely false
Explanation: Definitely false: This would be correct only if there was a clear contradiction within the passage or if a statement was factually…
Correct answer: Definitely false- A. A
- B. B
- C. C
- D. D
Explanation: We need to find the student who is listed in all three subject groups. D is listed as being good at "Physics and History" and also at…
Correct answer: D- A. If only I is most appropriate
- B. If only II is most appropriate
- C. If either I or II is most appropriate
- D. If neither I nor II is most appropriate
Explanation: The problem is a loss of customers to a competitor due to price. The most direct way to address this is to become more price-competitive…
Correct answer: If only I is most appropriate- A. Heterozygous
- B. Genotype
- C. Homozygous
- D. Phenotype
Explanation: An organism is homozygous when it carries two identical alleles for a particular gene.
Correct answer: Homozygous138. In Mendel's experiment, traits like seed color , flower color, pod color etc are referred to as:
- A. Alleles
- B. Phenotypes
- C. Genotypes
- D. Karyotype
Explanation: Phenotype refers to the observable traits of an organism, determined by its genotype and environment.
Correct answer: Phenotypes- A. Chromatids
- B. Alleles
- C. Chromosomes
- D. None of the above
Explanation: Pisum sativum has 14 chromosomes (2n = 14) arranged in 7 homologous pairs.
Correct answer: Alleles- A. Seven pairs
- B. Eight pairs
- C. Nine pairs
- D. Ten pairs
Explanation: Pisum sativum has 14 chromosomes (2n = 14) arranged in 7 homologous pairs.
Correct answer: Seven pairs