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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Read the Inheritance notesFree MDCAT chapter notes with key terms1,238 questions · page 18 of 62
341. In epistasis:
- A. One gene dominates the other gene
- B. One gene interferes the affect of the other gene
- C. One gene hides the affect of the other gene
- D. All of the above
Explanation: Epistasis is a circumstance where the expression of one gene is modified (e.g., masked, inhibited or suppressed) by the expression of one…
Correct answer: All of the above- A. Continuously varying trait
- B. It is controlled by many gene
- C. It depends on the quantity of allele
- D. All of the above
Explanation: A quantitative trait is one that can be measured numerically, such as height.
Correct answer: All of the above- A. Continuously varying trait
- B. It is controlled by one gene
- C. It depends on the quantity of allele
- D. All of the above
Explanation: A qualitative trait is one that can be classified into one of several categories.
Correct answer: It is controlled by one gene344. In pleiotropy:
- A. One gene dominates the other gene
- B. One gene interferes the effect of the other gene
- C. One gene hides the effect of the other gene
- D. One gene affects two or more traits
Explanation: "PLEIOTROPY" refers to the phenomenon in which a single locus affects two or more apparently unrelated phenotypic traits and is often…
Correct answer: One gene affects two or more traits- A. More common in one sex
- B. Expressed only in one sex
- C. Common in both sexes
- D. All of the above
Explanation: These are genes that occur in both sexes (probably on the autosomes) but are normally expressed only in the gender having the appropriate…
Correct answer: Expressed only in one sex- A. The gene for eye color is located on X chromosome
- B. Y-chromosome is empty for gene
- C. Sex linked trait are more common in females
- D. Female can be homozygous or heterozygous
Explanation: Sex-linked traits in humans appear more often in males than in females due to the presence of only one X chromosome in males.
Correct answer: Sex linked trait are more common in females- A. More common in males
- B. More common in females
- C. Common in both male and females
- D. None of the above
Explanation: The pattern of X-linked dominant inheritance is different from X-linked recessive. It is more common in females than males.
Correct answer: More common in females- A. Same sexes as the original cross
- B. Sexes are reversed as compared to original cross
- C. It is cross between dominant and recessive genes
- D. It is cross between two dominant genes
Explanation: Reciprocal cross is a kind of crossing strategy, which means to make crosses between a pair of parents (A and B) by using them in turn as…
Correct answer: Sexes are reversed as compared to original cross- A. All white eye offspring
- B. All red eye offspring
- C. 50% white and 50% red
- D. 75% red and 25% white
Explanation: Morgan mated this white-eyed male with a wild type red-eyed female. All 1237 offspring of this cross had red eyes
Correct answer: All red eye offspring- A. Gene
- B. Trait
- C. Genotype
- D. Phenotype
Explanation: A gene is the basic physical and functional unit of heredity. Genes are made up of DNA.
Correct answer: Gene- A. Focus
- B. Locus
- C. Allele
- D. Genotype
Explanation: A locus, as related to genomics, is a physical site or location within a genome (such as a gene or another DNA segment of interest)…
Correct answer: Locus- A. Alleles
- B. Traits
- C. Characters
- D. Gene pool
Explanation: "Allele" is the word that we use to describe the alternative form or versions of a gene.
Correct answer: Alleles- A. Genotype
- B. Phenotype
- C. Pleiotropy
- D. Epistasis
Explanation: Phenotype refers to an individual's observable traits, such as height, eye color and blood type.
Correct answer: Phenotype- A. Trait
- B. Allele
- C. Hybrid
- D. None of the above
Explanation: The genetic make up of a particular trait is called a genotype.
Correct answer: Trait- A. Gene pool
- B. Genotype
- C. Phenotype
- D. Multiple alleles
Explanation: A gene pool refers to the combination of all the genes (including alleles) present in a reproducing population or species.
Correct answer: Gene pool356. Mendel was born in:
- A. 1822
- B. 1884
- C. 1902
- D. 1910
Explanation: Two hundred years ago, on 20 July 1822, Gregor Johann Mendel was born in the small Silesian town of Heinzendorf bei Odrau at that time a…
Correct answer: 1822357. Mendel died in:
- A. 1822
- B. 1884
- C. 1902
- D. 1910
Explanation: Mendel died on 6 January 1884, at the age of 61
Correct answer: 1884- A. Drosophila melanogaster
- B. Pisum sativum
- C. Oryza sativa
- D. Triticum inheritance
Explanation: He performed a series of breeding experiments on garden pea, Pisum sativum in his monastery garden for eleven years (1854 - 1865).
Correct answer: Pisum sativum- A. Monohybrid cross
- B. Single trait inheritance
- C. Dihybrid cross
- D. Both A and B
Explanation: A monohybrid cross is a process of mating between two individuals with dominant genotypes, homozygous genotypes or alleles with hereditary…
Correct answer: Both A and B- A. 3 : 1
- B. 1 : 2 : 1
- C. 9 : 3 : 3 : 1
- D. 9 : 3 : 2 : 1
Explanation: Produces an expected genotypic ratio of 1:2:1 among AA, Aa, & aa genotypes.
Correct answer: 1 : 2 : 1