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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1061. An Rh−ve man marries an Rh+ve (homozygous) woman.What are the chances of their children being Rh+ve?
- A. 0%
- B. 25%
- C. 50%
- D. 100%
Explanation: The correct answer is 100%. An Rh−ve man has a genotype of 'rr', meaning he can only pass on the 'r' allele.
Correct answer: 100%- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: The correct depiction of pleiotropic inheritance is shown in Option C. Pleiotropy occurs when one gene influences multiple phenotypic…
Correct answer: Option C- A. M blood group
- B. N blood group
- C. O blood group
- D. MN blood group
Explanation: There are three general phenotypes; M,N and MN. M phenotype has antigen M which is produced by gene LM.
Correct answer: MN blood group1064. A trait whose alleles are present in both male and female but expresses more in one sex than other
- A. Sex-linked trait
- B. Sex-influenced trait
- C. Sex-limited trait
- D. Y-linked trait
Explanation: Sex-linked, as related to genetics, refers to characteristics (or traits) that are influenced by genes carried on the sex chromosomes.
Correct answer: Sex-influenced trait- A. Black
- B. Chocolate
- C. Yellow
- D. White
Explanation: In Labrador retrievers, the genotype Bbee would result in a black coat color.
Correct answer: Black- A. all phenotypes will be similar to the male parent
- B. all phenotypes will be similar to the female parent
- C. there will be 1:1 between both parental phenotypes
- D. there will be 100% recombinant phenotypes
Explanation: D) The correct answer is 100% recombinant frequency. This occurs because if one pair of alleles exhibits complete dominance (A and a) and…
Correct answer: there will be 100% recombinant phenotypes- A. Zero %
- B. 25%
- C. 50%
- D. 100%
Explanation: To determine the probability of albinism in the children of this couple, we can use Punnett squares.Let's denote the normal allele as "N"…
Correct answer: 100%- A. Sex-influenced trail
- B. Sex-limited trait
- C. Y-linked trait
- D. Sex linked recessive trait
Explanation: Sex-influenced traits are autosomal traits that are influenced by sex. If a male has one recessive allele, he will show that trait, but it…
Correct answer: Sex-influenced trail- A. 25%
- B. 50%
- C. 75%
- D. 100%
Explanation: When true breeding red (RR) and white (rr) flowering plants are crossed, all offspring are heterozygous (Rr) and display the pink…
Correct answer: 50%- A. Carrier mother and a colour blind father
- B. Carrier mother and an unaffected father
- C. Colour blind mother and an unaffected father
- D. Unaffected, non-carrier mother and a colour blind father
Explanation: The correct answer is a carrier mother and a color blind father. A carrier mother has one normal X chromosome and one affected X…
Correct answer: Carrier mother and a colour blind father- A. Protenor bugs
- B. Grasshoppers
- C. Butterflies
- D. Fruit flies
Explanation: The correct answer is butterflies. In the ZW sex-determination system, which is observed in butterflies, moths, and birds, the female is…
Correct answer: Butterflies- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: In the cross mother should be XX, father should be XY and son should be XY. Option D gives the correct representations.
Correct answer: Option D- A. Mother is carrier, father is normal
- B. Mother is hemophiliac, father is normal
- C. Mother is carrier, father is hemophiliac
- D. Mother is normal, father is hemophiliac
Explanation: C is the correct option.For a female to have haemophilia, she must inherit an affected X chromosome from each parent.
Correct answer: Mother is carrier, father is hemophiliac- A. Red-eyed males
- B. White-eyed males
- C. Red-eyed homozygous females
- D. White-eyed homozygous females
Explanation: Red eye homozygous female is not possible because female will inherit one white eye allele from father. So option C is correct.
Correct answer: Red-eyed homozygous females- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: A son must have the genotype XY, with X being inherited from mother and Y from father. Option B correctly represents it.
Correct answer: Option B- A. X chromosomes relative to the number of autosomes
- B. Y chromosomes relative to the number of autosomes
- C. Autosomes relative to the number of XY chromosomes
- D. Y chromosomes relative to the number of X chromosomes.
Explanation: In Drosophila, sex determination is based on the ratio of X chromosomes to sets of autosomes (A), rather than the presence of a Y…
Correct answer: X chromosomes relative to the number of autosomes- A. He inherited the recessive allele from his mother
- B. He inherited the dominant allele from his father
- C. He can pass the disease to a son
- D. He can pass a dominant allele to a daughter
Explanation: This statement is correct. Since hemophilia is an X-linked recessive disorder, a male with hemophilia inherits the affected X chromosome…
Correct answer: He inherited the recessive allele from his mother- A. Beard growth
- B. Baldness
- C. Haemophilia
- D. Tfm
Explanation: Testicular feminization, also known as androgen insensitivity syndrome (AIS), is a genetic condition in which individuals with XY…
Correct answer: Tfm- A. Mother: Carrier, Father: Normal
- B. Mother: Colour blind, Father: Carrier
- C. Mother: Normal, Father: Carrier
- D. Mother: Normal, Father: Color blind
Explanation: Since color blindness is an X-linked recessive disease so if the the mother is color blind and the father is normal only then the son…
Correct answer: Mother: Normal, Father: Color blind- A. Y-linked recessive
- B. Sex influenced
- C. Sex limited
- D. Sex linked recessive
Explanation: Hemophilia is more common in males because the gene responsible for hemophilia is located on the X chromosome, making it a sex-linked…
Correct answer: Sex linked recessive