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 25 of 62
- A. Short sighted vision disorder
- B. Night blindness
- C. Long sighted vision disorder
- D. Color blindness
Explanation: Color blindness also known as color vision deficiency (CVD) is a condition where you don't see colors in the traditional way.
Correct answer: Color blindness- A. Hypostasis
- B. Pleiotropy
- C. Epistasis
- D. Epitrop
Explanation: Epistasis is the interaction of genes, which are not alleles, leading to the suppression of the effect of one gene due to the presence of…
Correct answer: Epistasis- A. Polygenes
- B. Multiple alleles
- C. Multiple genes
- D. Multiple mutation
Explanation: Option B is correct. The ABO blood system is an example of multiple alleles. Multiple alleles are different forms of the same gene.
Correct answer: Multiple alleles- A. 23
- B. 24
- C. 21
- D. 22
Explanation: Humans have 22 pairs of autosomes, which are the non-sex chromosomes. These autosomes are numbered from 1 to 22 and carry genetic…
Correct answer: 22- A. Sex-linked inheritance
- B. Polygenic inheritance
- C. X-linked inheritance
- D. Y-linked inheritance
Explanation: Polygenic inheritance: This option is the correct answer. Human skin color is a good example of polygenic inheritance.
Correct answer: Polygenic inheritance- A. Hypophosphatemia
- B. Vitamin-D resistant rickets
- C. Hemophilia
- D. Diabetes Mellitus
Explanation: Hemophilia: This option is the correct answer. Hemophilia is an X-linked recessive disorder characterized by impaired blood clotting due…
Correct answer: Hemophilia- A. 100%
- B. 10%
- C. 16.6%
- D. 50%
Explanation: The ratio of the probability of the birth of a son to that of a daughter is always 1:1, regardless of the gender of the older children.
Correct answer: 50%- A. Small letter
- B. Both of these
- C. None of these
- D. Capital letter
Explanation: A homozygous dominant trait of an allele is represented by a capital letter, while a homozygous recessive trait is represented by a small…
Correct answer: Capital letter- A. Another unknown green pea
- B. Any genotype
- C. Homozygous dominant
- D. Homozygous recessive (cc) or known heterozygous (Cc)
Explanation: d) Homozygous recessive (cc) or known heterozygous (Cc) Explanation: This option is correct.
Correct answer: Homozygous recessive (cc) or known heterozygous (Cc)- A. Homozygous
- B. X-chromosomes
- C. Y-chromosomes
- D. Heterozygous
Explanation: Genotypes are described as homozygous if there are two identical alleles at a particular locus and as heterozygous if the two alleles…
Correct answer: Heterozygous- A. 0.25
- B. 0.5
- C. 0
- D. 1
Explanation: Here is the cross, P1 generation: True breeding tall (TT) ✕ true breeding small (tt) F1 generation:All the offsprings are heterozygous…
Correct answer: 0- A. XO-XX
- B. XY-XX
- C. ZZ-ZW
- D. None of these options are correct
Explanation: In contrast to the XY sex-determination system and the X0 sex-determination system, where the sperm determines the sex, in the ZW system…
Correct answer: ZZ-ZW- A. The daughters are just as likely to be hemophilic as the sons are
- B. 50% of the daughters will have hemophilia
- C. None of the children will have hemophilia because the mother is the only carrier
- D. 50% of sons will have hemophilia
Explanation: In the given scenario where a mother is a carrier of the sex-linked recessive disease hemophilia and mates with a healthy man, the…
Correct answer: 50% of sons will have hemophilia- A. 11
- B. 22
- C. 44
- D. 45
Explanation: A human sperm is a haploid gamete that contains half the number of chromosomes found in somatic cells.
Correct answer: 22- A. 1/2
- B. 1/4
- C. 1/8
- D. 1/16
Explanation: Option B is correct since there are only two out of 16 offspring homozygous for both traits: Hence: 4/16=1/4 (AABB, AAbb, aaBB, aabb)
Correct answer: 1/4- A. 40%
- B. 50%
- C. 75%
- D. 1
Explanation: Option D is correct since when the gene expresses itself the penetrance would be completely equal to 1.
Correct answer: 1- A. Incomplete dominance
- B. Independent assortment
- C. Penetrance
- D. Codominance
Explanation: The phenomenon which describes the 1:1 ratio in the final generation is Codominance, which relates to genetics, refers to a type of…
Correct answer: Codominance- A. 0.25
- B. 0.5
- C. 0
- D. 1
Explanation: Assuming that the tall plant is homozygous dominant (TT) for height and the dwarf plant is homozygous recessive (tt), the F1 generation…
Correct answer: 0.25- A. Morphology
- B. Physiology
- C. Genetics
- D. All of these
Explanation: Phenotypes refers to the observable features of organisms which is the morphology, the structure of the organism.
Correct answer: Morphology- A. Codominance
- B. Dominance
- C. Incomplete dominance
- D. Complete dominance
Explanation: When the phenotype represents only the effect of the dominant, with no sign of recessive phenotype, then there is complete dominance of…
Correct answer: Complete dominance