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. X chromosome
- B. Y chromosome
- C. Chromosome 11
- D. Chromosome 13
Explanation: Y linked traits are known as holandric traits. A few characters are Y linked and these are growth discovered on Y chromosome such as…
Correct answer: Y chromosome- A. Gene frequency
- B. Genome
- C. Gene pool
- D. Genotype
Explanation: A gene pool refers to the combination of all the genes (including alleles) present in a reproducing population or species.
Correct answer: Gene pool- A. Pleiotropy
- B. Dominance
- C. Epistasis
- D. Polygene
Explanation: Dominance refers to the relationship between two versions of a gene. Individuals receive two versions of each gene, known as alleles, from…
Correct answer: Dominance- A. Factor VII
- B. Factor IX
- C. Factor VIII
- D. Factor XI
Explanation: Hemophilia A is characterized by a deficiency in factor VIII clotting activity that results in prolonged bleeding after injuries, tooth…
Correct answer: Factor VIII865. XXY in humans is a:
- A. Sterile male
- B. Fertile male
- C. Sterile female
- D. Fertile female
Explanation: XXY individual produced through nondisjunction gametes in humans is a sterile male called Klinefelter's syndrome
Correct answer: Sterile male- A. Phenotype
- B. Gene pool
- C. Genotype
- D. Karyotype
Explanation: In a broad sense, the term "genotype" refers to the genetic makeup of an organism; in other words, it describes an organism's complete set…
Correct answer: Genotype- A. Homozygous and tall heightened
- B. Heterozygous and tall heighted
- C. Homozygous and short heightened
- D. Heterozygous and short heighted
Explanation: He called it first parental generation (Pi). Their offspring were called Fi or first filial generation.
Correct answer: Heterozygous and tall heighted- A. Phenotypically MN, O, and positive
- B. Phenotypically MN, A, and negative
- C. Phenotypically MN, A and positive
- D. Phenotypically MN, O and negative
Explanation: MN phenotype has both M and N antigens, simultaneously produced by their alleles LM and LN.
Correct answer: Phenotypically MN, O, and positive- A. Co-dominant alleles
- B. Jumping genes
- C. Multiple alleles
- D. Homozygous
Explanation: Multiple alleles can be defined as a series of forms of a gene situated at the same locus of homologous chromosomes.
Correct answer: Multiple alleles- A. 2 homozygous forms
- B. Homozygous recessive and heterozygous form
- C. 2 heterozygous forms
- D. A homozygous dominant and heterozygous form
Explanation: It is a mating in which an individual showing a dominant phenotype is crossed with an individual showing its recessive phenotype.
Correct answer: A homozygous dominant and heterozygous form- A. VII
- B. IX
- C. VIII
- D. X
Explanation: 80% hemophiliacs suffer from hemophilia A due to abnormality of factor VIII
Correct answer: VIII- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: In this option, both parents have the genotype "OO." The blood group O is represented by the genotype "OO." However, this combination of…
Correct answer: Option D- A. Gene
- B. Locus
- C. Chromosome
- D. Allele
Explanation: The correct answer to the question is A) Gene. Genes are the fundamental units of biological information that determine an organism's…
Correct answer: Gene- A. Only dominant offspring
- B. Only recessive offspring
- C. Both with ratio 3:1
- D. Offspring identical to the parents
Explanation: The correct option is D) Offspring identical to the parents. True-breeding varieties are homozygous for a particular trait, meaning they…
Correct answer: Offspring identical to the parents875. Gene linkage is:
- A. Physical relation of genes
- B. Physiological relation
- C. Both of these
- D. None of these
Explanation: The correct option is A) Physical relation of genes. Gene linkage is based on the physical proximity of genes on the same chromosome…
Correct answer: Physical relation of genes- A. Colour blindness
- B. Diabetes insipidus
- C. Haemophilia
- D. Leukemia
Explanation: The correct option is D) Leukemia. Leukemia is not an X-linked trait; it is a form of cancer caused by mutations in various genes…
Correct answer: Leukemia- A. X chromosome
- B. Y chromosome
- C. Autosomal chromosomes
- D. Both on X and Y chromosomes
Explanation: The correct option is C) Autosomal chromosomes. In Drosophila, the male-determining genes are found on autosomal chromosomes, and the…
Correct answer: Autosomal chromosomes878. Which one of the traits zigzags from maternal grandfather through a carrier daughter to a grandson?
- A. Autosomal
- B. X-linked recessive
- C. Y-linked dominant
- D. X-linked dominant
Explanation: The correct option is B) X-linked recessive. In this case, the grandson would inherit the trait from his carrier mother who received the…
Correct answer: X-linked recessive879. What are the chances of a hemophilic son, whose mother is a carrier but whose father is normal?
- A. 0%
- B. 75%
- C. 25%
- D. 50%
Explanation: The father always passes on his Y chromosome since he does not have the hemophilia gene.
Correct answer: 50%- A. Colour blindness
- B. Maleness
- C. Ichthyosis
- D. Hemophilia
Explanation: Maleness is determined by the presence of a Y chromosome. Fathers pass their Y chromosome to their sons, which determines their maleness.
Correct answer: Maleness