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. 02
- B. 23
- C. 46
- D. 92
Explanation: All the genes on one chromosome form a single linkage group, and the number of linkage groups equals the haploid chromosome number, which…
Correct answer: 23- A. Hybrid breeds of plants
- B. Variations in coming generation
- C. True breeding plants
- D. Adaptation with their environment
Explanation: Repeated self pollination steadily removes heterozygotes, since each generation halves their proportion, until the line is homozygous and…
Correct answer: True breeding plants- A. The mother is a carrier and the father is normal
- B. The mother is hemophiliac and the father is normal
- C. The mother is carrier and the father is hemophiliac
- D. Both are normal
Explanation: A girl has two X chromosomes and needs the recessive allele on both, one from each parent, so the father must be haemophiliac himself and…
Correct answer: The mother is carrier and the father is hemophiliac- A. Yy x YY
- B. Yy x yy
- C. Yy x Yy
- D. YY x yy
Explanation: Crossing a heterozygote with a homozygous recessive gives half Yy and half yy, that is one yellow to one green, which is the classic test…
Correct answer: Yy x yy- A. All round green
- B. All round yellow
- C. All wrinkled yellow
- D. All wrinkled green
Explanation: Every offspring receives R and Y from one parent and r and y from the other, so all are RrYy and both dominant characters show, giving…
Correct answer: All round yellow- A. 0%
- B. 25%
- C. 50%
- D. 75%
Explanation: A colour blind mother carries the defective allele on both her X chromosomes, and a son receives his only X from her, so every son must be…
Correct answer: 0%- A. 7
- B. 67
- C. 85
- D. All
Explanation: Morgan studied about 85 inherited traits and mutations in Drosophila, using them to investigate genes, chromosomes and linkage.
Correct answer: 85- A. 1811
- B. 1927
- C. 1911
- D. 1990Educational Resources
Explanation: Crossing over was first observed and reported in 1911, during early genetic studies of linked genes and chromosome exchange.
Correct answer: 1911- A. 2
- B. 4
- C. 5
- D. None of these
Explanation: Genomic mapping is commonly divided into two main types: genetic mapping, based on recombination frequency, and physical mapping, based on…
Correct answer: 2- A. Scientific hypothesis
- B. Theory
- C. Scientific law
- D. Productive theory
Explanation: Mendel’s repeatedly supported conclusions about segregation and independent assortment became recognised as laws of inheritance because…
Correct answer: Scientific law- A. Morgan
- B. Darwin
- C. Aristotle
- D. Mendal
Explanation: Gregor Mendel is called the father of genetics because his pea-plant experiments established the basic laws of segregation and independent…
Correct answer: Mendal- A. Six
- B. Seven
- C. Eight
- D. Nine
Explanation: Mendel selected seven contrasting pairs of traits in Pisum sativum, including seed shape, seed colour and flower position.
Correct answer: Seven- A. Genotype
- B. Phenotype
- C. Heterotype
- D. Morphozygous
Explanation: The phenotype is the observable physical or physiological expression of an organism's genetic makeup, such as height, eye colour, or blood…
Correct answer: Phenotype- A. Inheritance
- B. Dominance
- C. Limiting factor
- D. Segregation
Explanation: Mendel's law of dominance describes how, in a heterozygote, one allele can express its trait while masking the expression of the other…
Correct answer: Dominance- A. Genotype
- B. Karyotype
- C. Gene pool
- D. Lethal gene
Explanation: A gene pool is the complete collection of all genes and their alleles present in a population at a given time.
Correct answer: Gene pool- A. Darwin
- B. Morgan
- C. Mendel
- D. De Vries
Explanation: Gregor Mendel formulated the law of segregation, which states that the two alleles of a gene separate during gamete formation, and the law…
Correct answer: Mendel- A. Negalli
- B. Bitson
- C. Dixon
- D. Robert Brown
Explanation: William Bateson coined the term allele for alternative forms of the same gene.
Correct answer: Bitson- A. Chromosomal aberration
- B. Insertion of gene
- C. Deletion of gene
- D. Point mutation
Explanation: Sickle-cell anaemia results from a single nucleotide substitution in the beta-globin gene, which changes one amino acid in haemoglobin, so…
Correct answer: Point mutation- A. Trait
- B. Phenotype
- C. Genotype
- D. Ratios
Explanation: A test cross mates an individual showing a dominant phenotype with a homozygous recessive individual.
Correct answer: Genotype- A. A' blood group
- B. B' blood group
- C. O' blood group
- D. AB' blood group
Explanation: AB blood group demonstrates codominance because IA and IB alleles are both expressed in the phenotype, producing both A and B antigens on…
Correct answer: AB' blood group