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. 1:3
- B. 3:9
- C. 3:1
- D. 9:3
Explanation: Option C is correct.In Mendel's experiments, the phenotypic ratio of recessive to dominant plants was 3:1.
Correct answer: 3:1- A. Monohybrid cross
- B. Test cross
- C. Dihybrid cross
- D. None of these
Explanation: Option B is correct. Yes, a cross between a homozygous recessive and a heterozygous plant is called a test cross.
Correct answer: Test cross823. Self-fertilization of F1 dihybrids, following an independent assortment of alleles, will result in:
- A. 3/16 tall, round 3/16 dwarf, wrinkled
- B. 9/16 tall, round 1/16 dwarf, round
- C. 9/16 tall, wrinkled 3/16 dwarf, round
- D. 3/16 tall, wrinkled 3/16 dwarf, round
Explanation: Option D is correct.Yes, self-fertilization of Fr dihybrids, following an independent assortment of alleles will result in a phenotypic…
Correct answer: 3/16 tall, wrinkled 3/16 dwarf, round- A. Synapse
- B. Crossing over
- C. Independent assortment
- D. All of these
Explanation: Option D is correct. Yes, the linkage was not observed in Mendelism due to independent assortment.
Correct answer: All of these825. In the Mendelian dihybrid cross, how many progenies in the F2 generation possess genotype rryy?
- A. 1/16
- B. 3/16
- C. 2/16
- D. 4/16
Explanation: Yes, in a Mendelian dihybrid cross, 1/16 of the progeny in the F2 generation will possess the genotype rryy.
Correct answer: 1/16- A. 50% purple and 50% white
- B. All white
- C. 30% white and 70% purple
- D. All purple
Explanation: Yes, the offspring of cross-fertilization of true breeding pea plants having purple-colored flowers with that of white-colored flowers…
Correct answer: All purple- A. Different alleles of a gene are both expressed in heterozygous condition
- B. One allele is completely dominant over the other and the presence of the recessive allele is functionally hidden so the heterozygote has the same round phenotype as homozygote.
- C. The phenotype of the heterozygote is intermediate between phenotypes of the two homozygotes.
- D. Gene mutations may produce many different alleles of a gene.
Explanation: Option C is correct. Incomplete dominance is a type of genetic inheritance in which the phenotype of the heterozygous offspring is…
Correct answer: The phenotype of the heterozygote is intermediate between phenotypes of the two homozygotes.- A. Have one alleles in its genome
- B. Have no alleles in its genome
- C. Have two of them in its genome
- D. None of these
Explanation: Option C is correct. Multiple alleles are different forms of the same gene that can exist in a population.
Correct answer: Have two of them in its genome- A. Complete dominance
- B. Mutation
- C. Sex linkage
- D. A and B
Explanation: Option D is correct. The polymorphic gene 'I' in humans has three multiple alleles, which are the result of mutation.
Correct answer: A and B- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Option B is correct. The genotype of blood group 'A' can be AA or AO. This is because the ABO blood group system is determined by the…
Correct answer: Option B- A. A and B groups only
- B. A and O groups only
- C. AB only
- D. All four groups
Explanation: Option B is correct. The blood group of the children of a woman with type A blood and a man with type O blood can only be type A or type…
Correct answer: A and O groups only- A. Six
- B. Four
- C. Three
- D. Five
Explanation: Option B is correct. The correct answer is four. The ABO blood grouping system is controlled by the ABO gene, which has three alleles: A…
Correct answer: Four- A. 50%
- B. 75%
- C. 25%
- D. 0%
Explanation: option A is correct. The probability of having blood group O in their offspring is 50%.
Correct answer: 50%- A. Color blindness
- B. Haemophilia
- C. Rh positive
- D. Albinism
Explanation: Colour Blindness and Haemophilia are X linked recessive traits while Albinism is autosomal recessive; lastly Rh factor is autosomal…
Correct answer: Rh positive- A. Turner's syndrome
- B. Sickle-cell anemia
- C. AIDS
- D. Erythroblastosis fetalis
Explanation: Yes, the Rh factor can be responsible for a condition called erythroblastosis fetalis.
Correct answer: Erythroblastosis fetalis- A. Human skin color
- B. Human eye color
- C. Human blood group
- D. Human Rh factor
Explanation: ABO blood group is first discovered in multiple allelic blood group systems in man.
Correct answer: Human blood group- A. Complete dominance and Co dominance
- B. Incomplete dominance and Codominance
- C. Over dominance and Incomplete dominance
- D. Complete dominance only
Explanation: Alleles for blood groups A and B are dominant over alleles for blood group O but are codominant to each other.
Correct answer: Complete dominance and Co dominance- A. Independent assortment of genes
- B. Mutation
- C. Crossing over
- D. Linkage
Explanation: 1. In terms of genetics and genomics, linkage describes how closely genes or other DNA sequences are located to one another on the same…
Correct answer: Linkage- A. No linkage between genes
- B. Partial linkage between genes
- C. Complete linkage between genes
- D. Tight linkage between genes
Explanation: Appearance of recombinants in equal proportions to their parents in next generation indicates that two genes are present further away from…
Correct answer: No linkage between genes- A. Gout
- B. Albinism
- C. Sickle cell anemia
- D. Leukemia
Explanation: Genes for colour blindness, haemophilia, gout etc. form one linkage group on human X chromosome.
Correct answer: Gout