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 23 of 62
- A. Sex-linked trait
- B. Sex-limited trait
- C. Sex-influenced trait
- D. X-linked trait
Explanation: Please refer to the image attached. (PTB, Variation and Genetics)
Correct answer: Sex-influenced trait- A. Mother is Rh-positive and Baby is Rh-negative
- B. Mother is Rh-negative and the Baby is Rh-positive
- C. Both Mother and Baby are Rh-negative
- D. Both Mother and Baby are Rh-positive
- E. All of the above statements are true
Explanation: When an Rh-negative mother has an Rh-positive child, erythroblastosis fetalis occurs.
Correct answer: Mother is Rh-negative and the Baby is Rh-positive- A. 1 black male : 1 ginger male : 2 tortoise - shell females
- B. 1 black male : 1 ginger male : 1 tortoise - shell female : 1 black female
- C. 2 black males : 1 tortoise - shell female : 1 ginger female
- D. 1 black male : 1 tortoise - shell female : 1 ginger female : 1 black female
- E. 2 black males : 1 tortoise - shell female : 1 black female
Explanation: A black male has a genotype of XbY Tortoise-shell female kittens will have: XbXg XbY and XbXg XbXb; XbXg; XbY; XgY Hence: 1 Black-female…
Correct answer: 1 black male : 1 ginger male : 1 tortoise - shell female : 1 black female- A. 1
- B. 2
- C. 3
- D. 4
Explanation: To understand and solve this, you can divide your thinking into two. For character 1.
Correct answer: 2- A. X-linked recessive
- B. X-linked dominant
- C. Autosomal dominant
- D. Autosomal recessive
Explanation: Every man body has 23 pairs of chromosomes. One of these pairs is made up of 2 sex chromosomes. These are called X and Y chromosomes.
Correct answer: X-linked recessive- A. Back cross
- B. Test cross
- C. Reverse cross
- D. None of the above
Explanation: (A: Backcrossing) is a crossing of a hybrid with one of its parents. There is no "reverse cross" in genetics.
Correct answer: Back cross- A. IA IA
- B. IB IB
- C. IB IO
- D. IB IB and IB IO
Explanation: A is the correct option because the genotype of the mother is IA IA. A child with blood group AB will have a genotype IA IB.
Correct answer: IA IA- A. 25%
- B. 50%
- C. 75%
- D. 100%
Explanation: Given that the man's father was Rh-negative and the man is Rh-positive, the man must be heterozygous for Rh-positive.
Correct answer: 50%- A. Unifactorial
- B. Multifactorial
- C. Down syndrome
- D. Turner syndrome
Explanation: The disease, which is caused by a defect in a single gene or pair of genes is referred to as a unifactorial gene.
Correct answer: Unifactorial- A. Sickle cell anemia
- B. Albinism
- C. Leukemia
- D. Gout
Explanation: Genes for color blindness, hemophilia, gout, etc form one linkage group in humans.
Correct answer: Gout- A. Dominant
- B. Recessive
- C. Co-dominant
- D. Multiple
Explanation: In a Co-dominant scenario, the two different alleles of the gene contributing to a particular characteristic would express themselves in a…
Correct answer: Co-dominant- A. B
- B. O
- C. AB
- D. A
Explanation: Blood group AB has both A and B antigens, but no antibodies.
Correct answer: AB- A. Blood group B
- B. Blood group AB
- C. Blood group O
- D. Blood group A
Explanation: (c) : The blood group was O. The person having O blood group is the universal donor.
Correct answer: Blood group O- A. Both A and B antigens on RBC but no antibodies in the plasma
- B. Both A and B antibodies in the plasma
- C. No antigen on RBC and no antibody in the plasma
- D. Both A and B antigens in the plasma but no antibodies
Explanation: (a): Individuals with the AB blood group have both antigens A and B on their RBCs and no antibodies for either of the antigens in their…
Correct answer: Both A and B antigens on RBC but no antibodies in the plasma- A. Due to some defect like aspermia in man.
- B. Due to the genetic make up of the particular sperm which fertilizes the egg.
- C. Due to the genetic make up of the egg.
- D. Due to some defect in the women.
Explanation: Establishment of sex through differential development in an individual at an early stage of life is called sex determination.
Correct answer: Due to the genetic make up of the particular sperm which fertilizes the egg.- A. Lower case letter
- B. Roman numeral
- C. Capital letter
- D. Numerical value
Explanation: Homozygous dominant are representated by capital letters and recessive are represented by lower case letters.
Correct answer: Capital letter- A. Equal probabilities exist in both male and female individuals.
- B. Different probabilities in male and female individuals
- C. More probabilities in male than female individuals
- D. More probabilities in female than male individuals
Explanation: Option A is correct as Autosomal inheritance refers to the inheritance of a gene located on one of the 22 pairs of non-sex chromosomes in…
Correct answer: Equal probabilities exist in both male and female individuals.- A. 1:1
- B. 3:1
- C. 1:2:1
- D. 4:1
- E. 3:2:1
Explanation: According to the law of segregation,when two pure breeds are crossed(e.g.
Correct answer: 1:2:1- A. PRSQ
- B. PSRQ
- C. QSPR
- D. RQSP
- E. SPRQ
Explanation: This is a tricky question. A question like this also appeared in the AKU 2022 test.
Correct answer: PSRQ- A. A
- B. B
- C. AB
- D. O
Explanation: Option D is the correct option because people with type O blood are called universal donors because their donated red blood cells have no…
Correct answer: O