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
- B. 2
- C. 3
- D. 4
Explanation: 2 - Correct. The genotype produces two gametes: AB and aB
Correct answer: 2- A. All genes in all organisms
- B. All linked genes only
- C. All genes of pea plant only
- D. All non-linked genes only
Explanation: All non-linked genes only - Correct. The law applies to genes on different chromosomes.
Correct answer: All non-linked genes only- A. Somaclonal variation
- B. Polyteny
- C. Aneuploidy
- D. Polyploidy
Explanation: Polyploidy is the phenomenon of the occurrence of more than two sets of chromosomes in the nucleus of a cell.
Correct answer: Polyploidy- A. A, B, AB and O
- B. O only
- C. A and B only
- D. A, B and AB only
Explanation: The man has blood group A, thus its genotype can either be IA IA or IA IO. Similarly, the woman can either have IB IB, or IB IO genotype.
Correct answer: A, B, AB and O- A. Has 45 chromosomes with XO
- B. Has one additional X chromosome
- C. Exhibits male characters
- D. Is able to produce children with normal husband.
Explanation: A human female with Turner's syndrome has single-sex chromosome i.e., 44 + X0 (45).
Correct answer: Has 45 chromosomes with XO- A. It is a dominant disease.
- B. A single protein involved in the clotting of blood is affected.
- C. It is a sex-linked disease.
- D. It is a recessive disease.
Explanation: They asked the WRONG statement about haemophilia in option A. Haemophilia is a sex-linked disease which is also known as bleeder's…
Correct answer: It is a dominant disease.- A. Down's syndrome
- B. Jaundice
- C. Klinefelter's syndrome
- D. Sex of the fetus
Explanation: Amniocentesis is a fetal sex determination test in which amniotic fluid containing fetal cells that surrounds the developing embryo is…
Correct answer: Jaundice- A. Partial dominance
- B. Complete dominance
- C. Co-dominance
- D. Incomplete dominance
Explanation: The phenomenon of expression of both alleles in a heterozygote is called co-dominance.
Correct answer: Co-dominance- A. Inheritance of one gene
- B. Co-dominance
- C. Incomplete dominance
- D. Complete dominance
Explanation: In codominance, both the alleles are able to express themselves independently when present together resulting in a phenotype that is…
Correct answer: Co-dominance- A. It confirms that DNA is the carrier of genetic information.
- B. It helps to understand whether the trait in question is dominant or recessive.
- C. It confirms that the trait is linked to one of the autosome.
- D. It helps to trace the inheritance of a specific trait
Explanation: Pedigree analysis is a system of analysis following the movement and distribution of certain genetic traits in many generations of a…
Correct answer: It confirms that DNA is the carrier of genetic information.- A. 100%
- B. Zero percent
- C. 25%
- D. 50%
Explanation: Color blindness is an X-linked disease. So, a woman whose father was color blind will be a carrier for the disease.
Correct answer: Zero percent- A. Codominance
- B. Dihybrid cross
- C. Monohybrid cross with complete dominance
- D. Monohybrid cross with incomplete dominance.
Explanation: The F2 generation in a Mendelian cross with a 1:2:1 genotypic and phenotypic ratio indicates a monohybrid cross with incomplete dominance.
Correct answer: Monohybrid cross with incomplete dominance.- A. Heterosis
- B. Transformation
- C. Splicing
- D. Metamorphosis
Explanation: The increased vigor displayed by the offspring from a cross between genetically different parents is called heterosis.
Correct answer: Heterosis- A. Homozygous sex chromosomes (ZZ) determine female sex in birds.
- B. XO type of sex chromosomes determine male sex in grasshopper.
- C. XO condition in humans as found in Turner's syndrome, determines female sex.
- D. Homozygous sex chromosomes (XX) produce male in Drosophila.
Explanation: XO type of sex chromosomes determines the male sex in grasshoppers. This type of sex-determination comes under the XX-XO type.
Correct answer: XO type of sex chromosomes determine male sex in grasshopper.- A. Between two genotypes with recessive trait
- B. Between two F1 hybrids
- C. The F 1 hybrid with a double recessive genotype
- D. Between two genotypes with dominant trait
Explanation: A test cross is performed to determine the genotype of the F2 plant. In a typical test cross, an organism showing dominant phenotype and…
Correct answer: The F 1 hybrid with a double recessive genotype- A. Three
- B. One
- C. Four
- D. Two
Explanation: The three alleles IA, IB, and i of gene I in the ABO blood group system can produce six different genotypes and four different phenotypes…
Correct answer: Four- A. Tightly linked genes on the same chromosomes show higher recombinations
- B. Genes far apart on the same chromosome show very few recombinations
- C. Genes loosely linked on the same chromosome show similar recombinations
- D. Tightly linked genes on the same chromosome show very few recombinations
Explanation: Linkage is the phenomenon of certain genes staying together during inheritance through generations without any change or separation due to…
Correct answer: Tightly linked genes on the same chromosome show very few recombinations- A. The discrete unit controlling a particular character is called a factor.
- B. Out of one pair of factors one is dominant, and the other recessive.
- C. Alleles do not show any blending and both the characters recover as such in F2 generation.
- D. Factors occur in pairs
Explanation: According to Mendel's law of dominance, in heterozygous individuals, a character is represented by two contrasting factors called alleles…
Correct answer: Alleles do not show any blending and both the characters recover as such in F2 generation.- A. Galactosemia is an inborn error of metabolism
- B. Small population size results in random genetic drift in a population
- C. Baldness is a sex-limited trait
- D. Linkage is an exception to the principle of independent assortment in heredity
Explanation: Baldness is a sex-influenced trait. The dominance of alleles may differ in heterozygotes of the two sexes.
Correct answer: Baldness is a sex-limited trait- A. Overdominance of this type on the genes for A and B types
- B. One antibody only either anti A or anti B on the RBCs
- C. No antigens A and B on RBCs
- D. Other antigens besides A and B on RBCs
Explanation: In ABO blood group, O refers to O blood group. It has no antigen (A and B) on RBCs.
Correct answer: No antigens A and B on RBCs