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. Always heterozygous recessive
- B. Always heterozygous dominant
- C. Always homozygous recessive
- D. Always homozygous dominant
Explanation: Wrinkled shape in pea seed is a recessive trait having single genotype rr (homozygous recessive) as recessive can't be heterozygous
Correct answer: Always homozygous recessive- A. 3/16
- B. 1/16
- C. 9/16
- D. 6/16
Explanation: Phenotypic ratio of F2 of Mendel's dihybrid cross was as under.
Correct answer: 6/16- A. Genes, chromosomes
- B. Chromosomes, genes
- C. Genes, nucleotide sequence
- D. Genes, cells
Explanation: As genes are carried by chromosomes so both exhibit parallel behavior.
Correct answer: Genes, chromosomes- A. Sixteen years of his death
- B. Twenty years of his death
- C. Twenty-four years of his death
- D. Thirty-four years of his death
Explanation: In 1900, 16 years after Mendel's death, three botanists, Correns, DeVries and Tschermach independently rediscovered and acknowledged his…
Correct answer: Sixteen years of his death- A. A
- B. B
- C. C
- D. D
Explanation: According to the Mendel's law of segregation chromosomes split up into their respective chromatids during gametogenesis (meiosis) and each…
Correct answer: D- A. Sex chromosome
- B. Autosome
- C. X chromosome
- D. Y chromosome
Explanation: Man has 23 linkage groups. Genes for colour blindness, haemophilia, gout etc form one linkage group on human X - chromosome.
Correct answer: X chromosome- A. 37.5
- B. 62.5
- C. 66.5
- D. 33.5
Explanation: 9/16 round yellow + 1/16 wrinkled green Total=10/16*100=62.5%
Correct answer: 62.5- A. Homozygous dominant
- B. Homozygous recessive
- C. Heterozygous dominant
- D. Heterozygous recessive
Explanation: In P1 of test cross, one parent will always be homozygous recessive in order to check the homozygosity or heterozygosity of the parent…
Correct answer: Homozygous recessive949. Gene linkage means:
- A. Linkage of a gene with male
- B. Linkage of a gene with female
- C. Linkage of a gene with particular gender
- D. Linkage of a gene with a particular gene
Explanation: Gene linkage refers to the phenomenon where two or more genes are located close to each other on the same chromosome and tend to be…
Correct answer: Linkage of a gene with a particular gene- A. Meiosis
- B. Crossing over
- C. Mitosis
- D. Gametogenesis
Explanation: Linked genes can be separated by crossing over. Closer the gene located, more strongly are their genes linked.
Correct answer: Crossing over- A. Hemophilia
- B. Vitamin D resistant rickets
- C. Hypophosphatemic rickets
- D. SRY gene
Explanation: The gene for hemophilia is located on X-chromosome and it is a recessive trait.
Correct answer: Hemophilia- A. Mouse and Rabbit
- B. Dog and Sheep
- C. Donkey and Horse
- D. Mouse, rabbit, dog, sheep, donkey cattle, kangaroo and chimpanzee all
Explanation: As man along with mouse, rabbit, dog, sheep, donkey, cattle, kangaroo and chimpanzees belong to class mammalia of vertebrates and have…
Correct answer: Mouse, rabbit, dog, sheep, donkey cattle, kangaroo and chimpanzee all- A. Inheritance
- B. Coordination
- C. Excretion
- D. Respiration
Explanation: Gene are physical units of inheritance located on chromosomes and control the traits of organisms.A gene is a basic unit of heredity.
Correct answer: Inheritance- A. Chromosome
- B. DNA
- C. RNA
- D. Chromatid
Explanation: The sequence of nucleotides that determines the amino acid sequence of a protein is called a gene.
Correct answer: DNA- A. Chromosomes
- B. Genes
- C. Genomes
- D. Nucleic acids
Explanation: As genes are basic units of biological information, so they are responsible for transmission of parental characters to their offsprings as…
Correct answer: Genes- A. Inherited similarities are conserved.
- B. Non-inherited similarities are conserved.
- C. Variations emerge.
- D. Non-inherited variations emerge.
Explanation: If an entire set of genes of a parent are transferred to an offspring that offspring will be a clone of that parent i.e.
Correct answer: Inherited similarities are conserved.- A. Genetic continuity is conserved.
- B. Inherited variations are conserved.
- C. Variations occur.
- D. Inherited similarities are conserved.
Explanation: By reshuffling of genetic makeup of parents variants are produced and recombination occurs.
Correct answer: Variations occur.- A. Pairs, Pairs
- B. Pairs, tetrads
- C. Tetrads, pairs
- D. Tetrads, tetrads
Explanation: Gene pair occurs on pair of homologous chromosomes which indicates a parallelism in the behavior of gene and chromosome.
Correct answer: Pairs, Pairs- A. 19
- B. 9
- C. 11
- D. 21
Explanation: The ABO blood group locus is located on chromosome number 9. This locus determines the ABO blood group system, which classifies human…
Correct answer: 9- A. H
- B. D
- C. A
- D. B
Explanation: Substance H is associated with insertion of antigens on the surface of RBCs.
Correct answer: H