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. Bombay phenotype
- B. Codominance
- C. Epistasis
- D. Pleiotropy
Explanation: Epistasis is a circumstance where the expression of one gene is modified (e.g., masked, inhibited, or suppressed) by the expression of one…
Correct answer: Epistasis- A. Y chromosome
- B. X chromosome
- C. XY chromosome
- D. XX chromosome
Explanation: A sex chromosome is a type of chromosome involved in sex determination. Humans and most other mammals have two sex chromosomes, X and Y.
Correct answer: XX chromosome- A. Dominance
- B. Complete dominance
- C. Incomplete dominance
- D. Codominance
Explanation: Codominance, in genetics, is a phenomenon in which two alleles (different versions of the same gene) are expressed to an equal degree…
Correct answer: Codominance- A. Female
- B. Male
- C. Both (A) & (B)
- D. No effect
Explanation: XO in drosophila results in a sterile male. As XO means the absence of the second chromosome.
Correct answer: Male- A. Co-dominance
- B. Incomplete dominance
- C. Over dominance
- D. Complete dominance
Explanation: When the phenotypic expression of heterozygotes becomes more intense than the homozygous state of the dominant allele, is called…
Correct answer: Over dominance- A. 0
- B. 0.25
- C. 0.5
- D. 0.75
Explanation: probability of "Tt" genotype in F2 2/4 = 0.5
Correct answer: 0.5- A. Humans
- B. Butterflies
- C. Grasshopper
- D. Drosophila
- E. Both A and D
Explanation: The XY sex-determination system is the sex-determination system found in humans, most other mammals, some insects (Drosophila), and some…
Correct answer: Both A and D- A. Equal probabilities exist in both male and female individuals.
- B. Different probabilities in male and female individuals
- C. More probabilities in male than female individuals
- D. More probabilities in female than male individuals
Explanation: Option A is correct as Autosomal inheritance refers to the inheritance of a gene located on one of the 22 pairs of non-sex chromosomes in…
Correct answer: Equal probabilities exist in both male and female individuals.- A. Genotype
- B. Alleles
- C. Phenotype
- D. Genome
Explanation: Phenotype refers to an individual's observable traits, such as height, eye color, and blood type.
Correct answer: Phenotype- A. 0
- B. 0.25
- C. 0.50
- D. 0.75
Explanation: The woman had a color-blind father. He was, therefore: XcY. Herself, she has normal vision, meaning she is X+X.
Correct answer: 0.50- A. Gene linkage of P and Q
- B. Independent segregation of P and Q
- C. Mendelian dihybrid Inheritance
- D. Multiple alleles
- E. Polygenic Inheritance
Explanation: When a pure breeding phenotypic dominant character P and recessive character Q is crossed with pure breeding recessive character P and…
Correct answer: Gene linkage of P and Q- A. Wife
- B. Son
- C. Daughter
- D. Brother
Explanation: X chromosome of the father is only transferred to the daughter, son takes the Y chromosome and haemophilia is a X-linked diseaseAhmed, who…
Correct answer: Daughter- A. All black
- B. All white
- C. 3 black, 1 white
- D. 3 white, 1 black
Explanation: Hybrid black Guinea pigs have the genotype Bb, where B (black) is dominant and b (white) is recessive.
Correct answer: 3 black, 1 white- A. Sex-linked trait
- B. Sex limited trait
- C. Sex influenced trait
- D. X-linked trait
Explanation: Please refer to the image attached. (PTB, Variation and Genetics)
Correct answer: Sex influenced trait- A. Blood group B
- B. Blood group AB
- C. Blood group O
- D. Blood group A
Explanation: Blood group O individuals are considered universal donors because their red blood cells lack A or B antigens on their surfaces.
Correct answer: Blood group O- A. Both A and B antigens on RBC but no antibodies in the plasma
- B. Both A and B antibodies in the plasma
- C. No antigen on RBC and no antibody in the plasma
- D. Both A and B antigens in the plasma but no antibodies
Explanation: A person with blood group AB has both A and B antigens on the surface of their red blood cells (RBCs).
Correct answer: Both A and B antigens on RBC but no antibodies in the plasma- A. 0.25
- B. 0.5
- C. 0
- D. 1
Explanation: Correct expected frequency of dwarf plants in the F₂ (from TT × tt → F₁ Tt; F₁ × F₁) = 0.25 (Option A).Option B (0.5) would be correct for…
Correct answer: 0.25- A. The daughters are just as likely to be hemophilic as the sons are
- B. 50% of the daughters will have hemophilia
- C. None of the children will have hemophilia because the mother is the only carrier
- D. 50% of sons will have hemophilia
Explanation: In the given scenario where a mother is a carrier of the sex-linked recessive disease hemophilia and mates with a healthy man, the…
Correct answer: 50% of sons will have hemophilia- A. DNA
- B. RNA
- C. Heredity
- D. Genotype
Explanation: A gene is best described as the fundamental molecular unit of heredity because it carries information that is passed from one generation…
Correct answer: Heredity- A. 0%
- B. 25%
- C. 50%
- D. 75%
Explanation: The correct option is 0% . For a daughter to be color blind, she must inherit one recessive color blindness allele from both her mother…
Correct answer: 0%