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 : 3 : 3 : 1
- B. 2 : 1 : 1 : 2
- C. 1 : 2 : 2 : 1
- D. 7 : 5 : 3 : 1
Explanation: In a cross between AABB × aabb, the ratio of F 2 genotypes between AABB, AaBB, Aabb and aabb would be 1 : 2 : 2 : 1.
Correct answer: 1 : 2 : 2 : 1- A. Anaphase I
- B. Anaphase II
- C. Diplotene
- D. Metaphase I
Explanation: Let's go through each option individually and explain why the correct option is A, which is Anaphase I.
Correct answer: Anaphase I- A. Dominant
- B. Hybrid
- C. Heterozygous
- D. Homozygous
Explanation: The correct option is d) Homozygous. Now, let's explain each option individually: a) Dominant: The term "dominant" refers to an allele…
Correct answer: Homozygous- A. Colour blind sons and normal/carrier daughters
- B. Colour blind sons and daughters
- C. All colour blind
- D. All normal
Explanation: The correct option is: a) Colour blind sons and normal/carrier daughters.
Correct answer: Colour blind sons and normal/carrier daughters- A. Crossing over
- B. Linkage
- C. Sex-linked inheritance
- D. Non-disjunction of chromosomes.
Explanation: The correct option is d) Non-disjunction of chromosomes. Down's syndrome, also known as trisomy 21, is a genetic disorder caused by the…
Correct answer: Non-disjunction of chromosomes.- A. Down's syndrome
- B. Klinefelter's syndrome
- C. Turner's syndrome
- D. Edward's syndrome
Explanation: The correct option in this case is c) Turner's syndrome. Turner's syndrome is a chromosomal disorder that occurs in females and is…
Correct answer: Turner's syndrome- A. AB
- B. A
- C. O
- D. B
Explanation: The correct option would be d): B. To understand why, let's review the basics of blood types and their inheritance.
Correct answer: B- A. Multiple Alleles
- B. Allelomorphs
- C. Alloloci
- D. Paramorphs
Explanation: The correct option is b) Allelomorphs because it refers to the contrasting pairs of factors in Mendelian crosses.
Correct answer: Allelomorphs- A. Hugo de Vries
- B. Gregor Mendel
- C. Charles Darwin
- D. T.H Morgan
Explanation: The correct option is b) Gregor Mendel. Gregor Mendel is considered as the father of genetics.
Correct answer: Gregor Mendel790. Mendel's last law is
- A. Segregation
- B. Dominance
- C. Independent assortment
- D. Polygenic inheritance
Explanation: The correct option is c) Independent Assortment. c)Mendel's last law, also known as the third law or the law of independent assortment…
Correct answer: Independent assortment- A. Both blue eyed and brown eyed 1 : 1
- B. All brown eyed
- C. All blue eyed
- D. Blue eyed and brown eyed 3 : 1
Explanation: The correct option is Both blue-eyed and brown-eyed, 1:1. In summary, the correct option is Both blue-eyed and brown-eyed, 1:1, because if…
Correct answer: Both blue eyed and brown eyed 1 : 1- A. Codominant
- B. Supplementary
- C. Complementary
- D. Recessive
Explanation: The correct option is d): Recessive. The term "recessive" accurately describes an allele that is unable to express its effect in the…
Correct answer: Recessive793. Red (RR) Antirrhinum is crossed with white (WW) one. Offspring are pink (RW). This is an example of:
- A. Dominance
- B. Incomplete dominance
- C. Hybrid
- D. Supplementary genes
Explanation: The correct option is b) Incomplete dominance. In the given scenario, the cross between a red (RR) Antirrhinum (snapdragon) and a white…
Correct answer: Incomplete dominance- A. Her mother and maternal grand father were colour blind
- B. Her father and maternal grand father were colour blind
- C. Her mother is colour blind and father has normal vision
- D. Parents have normal vision but grand parents were colour blind
Explanation: The correct option is b) Her father and maternal grandfather were color blind.
Correct answer: Her father and maternal grand father were colour blind- A. 1 AaBB : 1 aaBB
- B. All AaBB
- C. 3 AaBB : 1 aaBB
- D. 1 AaBB : 3 aaBB
Explanation: The correct option is a) 1 AaBB : 1 aaBB. Let's explain why the other options are incorrect: b) All AaBB: This option suggests that all…
Correct answer: 1 AaBB : 1 aaBB- A. 9 : 6 : 1
- B. 15 : 1
- C. 9 : 3 : 4
- D. 12 : 3 : 1
Explanation: In a genetic cross having recessive epistasis, F2 phenotypic ratio would be 9 : 3 : 4.
Correct answer: 9 : 3 : 4- A. Multifactor inheritance
- B. Incomplete dominance
- C. Multiple allelism
- D. Epistasis
Explanation: The correct option is c) Multiple allelism. The ABO blood group system is determined by multiple allelism.
Correct answer: Multiple allelism- A. 75% recessive
- B. 50% recessive
- C. 25% recessive
- D. All dominant
Explanation: The correct option is b) 50% recessive. When Tt (heterozygous) mates with tt (homozygous recessive), the possible genotypes of the…
Correct answer: 50% recessive- A. XO
- B. XY
- C. XX
- D. XXY
Explanation: The correct option is b) XY. Down syndrome: also known as trisomy 21, is a genetic disorder caused by the presence of an extra copy of…
Correct answer: XY- A. Recessive character carried by Y-chromosome
- B. Dominant character carried by Y-chromosome
- C. Dominant trait carried by X-chromosome
- D. Recessive trait carried by X-chromosome
Explanation: The correct option is d) Recessive trait carried by X-chromosome. Haemophilia is a genetic disorder characterized by the impaired ability…
Correct answer: Recessive trait carried by X-chromosome