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. Darwin
- B. Mendell
- C. Wilhelm Johannsen
- D. None of these
Explanation: Wilhelm Johannsen first proposed the distinction between genotype and phenotype in the study of heredity while working in Denmark in 1909
Correct answer: Wilhelm Johannsen- A. A
- B. B
- C. AB
- D. O
Explanation: Option D is the correct option because people with type O blood are called universal donors because their donated red blood cells have no…
Correct answer: O- A. Genotype
- B. Phenotype
- C. Wild type
- D. All of these
Explanation: Option C is correct since genetic shift occurs within a population the mutant allele becomes wild type.
Correct answer: Wild type- A. 25% blue, 75% white
- B. 75% blue, 25% white
- C. All white
- D. All blue
Explanation: The phenotypic ratio for a cross between a plant with blue flowers (BB) and a plant with white flowers (bb) would be 100% blue.
Correct answer: All blue- A. Type A or type O
- B. Type B or type O
- C. Type AB only
- D. Type A, type B, or type AB
Explanation: d) Type A, type B, or type AB: Option (d) "Type A, type B, or type AB" is the correct answer.
Correct answer: Type A, type B, or type AB- A. Men
- B. Women
- C. Both A and B
- D. Children
Explanation: Pattern baldness is a sex-linked recessive trait, which indicates that it is carried on the X chromosome.
Correct answer: Men- A. VIII
- B. X
- C. IX
- D. XI
Explanation: Option A is wrong because haemophilia is not due to the abnormality of factor VIII.
Correct answer: IX- A. Locus
- B. Arm
- C. Position
- D. Location
Explanation: The particular place of the chromosome where a gene is located is called locus (plural: loci). Hence, A is the correct option.
Correct answer: Locus- A. 3:1
- B. 1:2:1
- C. 9:3:3:1
- D. None of these
Explanation: 9:3:3:1 phenotypic ratio was produced among F2 progeny
Correct answer: 9:3:3:1- A. It is dominant
- B. It is recessive
- C. It is wild type
- D. Both A and B
Explanation: Wildtype: a phenotype, genotype, or gene that predominates in a natural population of organisms or strain of organisms in contrast to that…
Correct answer: It is wild type- A. Fertile male
- B. Sterile female
- C. Fertile female
- D. Sterile male
Explanation: In Drosophila, XXY represents a female but in human it is an abnormal male, because Y chromosomes are essential for determining the sex of…
Correct answer: Fertile female- A. Spring
- B. Issue
- C. Progeny
- D. None of these
Explanation: The word filial comes from the Latin words filius, which means "son," and filia, or "daughter." Progeny means "offspring" or "children."…
Correct answer: Progeny- A. A,B antigen present
- B. Rh antigen present
- C. Rh antibody present
- D. Anti-A, Anti-B antibody present
Explanation: O negative blood can be used in transfusions for any blood type. Type O is routinely in short supply and in high demand by hospitals -…
Correct answer: Anti-A, Anti-B antibody present- A. All her children
- B. Half of her daughters
- C. All her daughters
- D. Half of her sons
Explanation: Here it shows that 25% of her children will be affected and 50% of her sons so the answer is D.
Correct answer: Half of her sons- A. The genotype is the expressed trait of the individual
- B. There are three possible phenotypes the organism can express
- C. If two heterozygous organisms mate, 25% of the progeny will be
- D. If two heterozygous organisms mate, 75% of the progeny will display the dominant phenotype.
Explanation: If two heterozygous organisms mate, the phenotypic ratio of dominant and recessive offspring is 3:1.
Correct answer: If two heterozygous organisms mate, 75% of the progeny will display the dominant phenotype.- A. Unknown purple X Homozygous purple
- B. Unknown purple X Unknown Purple
- C. Unknown purple X White
- D. None of these
Explanation: This option can result in: Either a 1:1 ratio of purple and white flowers. The unknown purple flower would be heterozygous.
Correct answer: Unknown purple X White- A. Phenotype
- B. Clone
- C. Recombination
- D. Genotype
Explanation: The genotype is the genetic makeup, or set of alleles, of an organism.
Correct answer: Genotype- A. 25%
- B. 50%
- C. 75%
- D. 100%
Explanation: Let allele for blue phenotype [dominant] =B, Let allele for whitephenotype [recessive] =b, Parental phenotypes =Bb[heterozygous] *bb…
Correct answer: 50%- A. Cross fertilized
- B. Cross pollinated
- C. Self fertilized
- D. None of these options is correct
Explanation: Pea plants also typically self-fertilize, meaning that the same plant makes both the sperm and the egg that come together in fertilization.
Correct answer: Self fertilized- A. Heterozygous
- B. Homozygous
- C. Hemizygous
- D. None of these options is correct
Explanation: Option A; If the two versions are different, you have a heterozygous genotype for that gene.
Correct answer: Hemizygous