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-linked
- B. Y-linked
- C. Sex limited
- D. Sex influenced
Explanation: Sex-influenced traits are autosomal traits that are influenced by sex. If a male has one recessive allele, he will show that trait, but it…
Correct answer: Sex influenced- A. Beard growth
- B. Colour blindness
- C. Baldness
- D. Rickets
Explanation: Women have two "X" chromosomes while men have one "X" and one "Y" chromosome.
Correct answer: Baldness- A. 100%
- B. 50%
- C. 25%
- D. Zero
Explanation: It is indicated that the male is dominant which makes his genotype "XBY".
Correct answer: Zero- A. Beard growth
- B. Colour blindness
- C. Baldness
- D. Diabetes
Explanation: It is a multifactorial disease. Type 2 diabetes is a complex multifactorial disease in which a pathological combination of metabolic and…
Correct answer: Diabetes325. Which of these traits zigzags from maternal grandfather through a carrier daughter to a grandson?
- A. Autosomal
- B. X-linked recessive
- C. Y-linked
- D. X and Y-linked
Explanation: X-linked recessive inheritance refers to genetic conditions associated with mutations in genes on the X chromosome.
Correct answer: X-linked recessive- A. 30%
- B. 50%
- C. 80%
- D. 90%
Explanation: Diabetes mellitus type II is non insulin dependent. It accounts for 90% of all diabetic patients.
Correct answer: 90%- A. NIDDM
- B. IDDM
- C. MODY
- D. None of the above
Explanation: Insulin dependent diabetes mellitus (IDDM), also known as type 1 diabetes, usually starts before 15 years of age, but can occur in adults…
Correct answer: IDDM- A. MODY
- B. NIDDM
- C. IDDM
- D. None of the above
Explanation: Type I (insulin-dependent) diabetes (IDDM) is an autoimmune disease with an unknown etiology but with a definite outcome, resulting in the…
Correct answer: IDDM- A. NIDDM
- B. IDDM
- C. MODY
- D. None of the above
Explanation: Since MODY is caused by a genetic mutation, a genetic test can also help diagnose it. This testing will determine the exact type of MODY.
Correct answer: MODY330. Locus is a:
- A. Part of DNA
- B. Position of gene
- C. Partner of gene
- D. Complement of genes
Explanation: The position of a gene on a chromosome is called locus.
Correct answer: Position of gene331. Genotype is:
- A. Form of appearance of a trait
- B. Genetic complement of an individual
- C. Partner of gene on chromosomes
- D. None of the above
Explanation: The genotype is the genetic makeup of a cell, an organism, or an individual usually with reference to a specific characteristic under…
Correct answer: Genetic complement of an individual- A. All tall
- B. 50% tall and 50% dwarf
- C. 75% tall and 25% dwarf
- D. 25% tall and 75% dwarfs
Explanation: When they are crossed, In the F1 generation all offspring are heterozygous tall, and when they are allowed to self-fertilize they produce…
Correct answer: 75% tall and 25% dwarf- A. Homozygous dominant
- B. Heterozygous dominant
- C. Homozygous recessive
- D. None of the above
Explanation: If the seed is heterozygous round (Rr), it will grow into a plant that forms half the gametes, with 'R`and half with `r` allele.
Correct answer: Heterozygous dominant- A. Genes are present on different chromosomes
- B. Genes are present on same chromosomes
- C. Genes are present on homologous chromosomes
- D. None of the above
Explanation: Linked genes are those genes which are present near each other on the same chromosome and thus tend to stay together and move as group…
Correct answer: Genes are present on same chromosomes335. Over-dominance is:
- A. The phenotype of the heterozygous is intermediate
- B. One allele is completely dominant over other
- C. Exceed the quantity than phenotype
- D. Both alleles are expressed
Explanation: In particular, the phenomenon known as overdominance occurs when a heterozygote has a more extreme phenotype than that of either of its…
Correct answer: Exceed the quantity than phenotype- A. Phenotype of the heterozygote is intermediate
- B. One allele is completely dominant over the other
- C. Exceed the quantity than phenotype
- D. Both alleles are expressed
Explanation: However, sometimes the heterozygote displays a phenotype that is an intermediate between the phenotypes of both homozygote parents (one of…
Correct answer: Phenotype of the heterozygote is intermediate- A. Inheritance
- B. Trait
- C. Variation
- D. Phenotype
Explanation: Heredity, also called inheritance or biological inheritance, is the passing on of traits from parents to their offspring; either through…
Correct answer: Inheritance- A. Rh- man marries to Rh+
- B. Rh+ man marries to Rh-
- C. Rh- man marries to Rh-
- D. Rh+ man marries to Rh+
Explanation: Erythroblastosis fetalis classically results from Rho(D) incompatibility, which may develop when a woman with Rh-negative blood is…
Correct answer: Rh+ man marries to Rh-339. Codominance is:
- A. Phenotype of the heterozygous is intermediate
- B. One allele is completely dominant over other other
- C. Exceed the quantity than phenotype
- D. Both alleles are expressed
Explanation: Explanation for this question will be added soon!
Correct answer: Both alleles are expressed- A. Only blood group A
- B. Only blood group B
- C. Only blood group O
- D. All of the above
Explanation: Since AB is a universal recipient because it does not have any antibodies against any antigen so it can receive all type of blood
Correct answer: All of the above