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 52 of 62
1021. All the genes/alleles found in a breeding population at a given time are collectively termed as:
- A. Genome
- B. Gene pool
- C. Genotype
- D. Karyotype
Explanation: The correct answer is 'Gene pool' because it represents the total collection of genes, including all variations or alleles, present in a…
Correct answer: Gene pool- A. BCAD
- B. CBAD
- C. ACBD
- D. ABCD
Explanation: The correct order of genes on the chromosome is CBAD. This order is determined by analyzing the recombination frequencies: a larger RF…
Correct answer: CBAD- A. All daughters will be color blind
- B. All daughters will be carriers
- C. All sons will be color blind
- D. Half of the sons will be color blind
Explanation: In this genetic scenario, the mother is a carrier of the color blindness allele, with a genotype of XhX, and the father is normal with a…
Correct answer: Half of the sons will be color blind- A. 100% of all females and males will be haemophilic
- B. Females have a 50% chance of being haemophilic, and males will be 100% haemophilic
- C. Carrier female 25%, haemophilic female 25%, normal male 25%, and haemophilic male 25%
- D. Females and males both have a 50% chance of being haemophilic
Explanation: In the genetic cross between a carrier female (XHXh) and a haemophilic male (XhY), the possible genotypes of the offspring can be…
Correct answer: Carrier female 25%, haemophilic female 25%, normal male 25%, and haemophilic male 25%- A. Gene frequency
- B. Genome
- C. Gene pool
- D. Genotype
Explanation: The correct answer is Gene pool. A gene pool includes all the genetic information, including all alleles, present in a population.
Correct answer: Gene pool- A. 8
- B. 10
- C. 7
- D. 14
Explanation: The correct answer is 7, which is the haploid chromosome number in peas.
Correct answer: 7- A. Prince Nicholas
- B. Leopold
- C. Rupert
- D. Charles
Explanation: The correct answer is Leopold, as he was the only son of Queen Victoria known to have hemophilia.
Correct answer: Leopold- A. Red blind
- B. Green blind
- C. Blue blind
- D. Red and Green blind
Explanation: Blue cone monochromacy is a rare form of color blindness where the blue cone photoreceptors are dysfunctional, leading to reliance on only…
Correct answer: Red and Green blind- A. Yellow pod
- B. Constricted pod
- C. Green colored seed
- D. Round shaped seed
Explanation: Mendel identified several traits in pea plants, Pisum sativum, and categorized them as dominant or recessive.
Correct answer: Round shaped seed- A. 1/4, 2/4, 1/4
- B. 2/4, 1/4, 1/4
- C. 1/4, 1/4, 2/4
- D. 2/4, 1/4, 2/4
Explanation: In a monohybrid cross involving a dominant and recessive allele (e.g., round and wrinkled), the Punnett square reflects a 3:1 phenotypic…
Correct answer: 1/4, 2/4, 1/41031. What is depicted from the results of the test cross given here below? Round = 50%, Wrinkled = 50%.
- A. The tested individual was heterozygous dominant
- B. The tested individual was heterozygous recessive
- C. The tested individual was homozygous dominant
- D. The tested individual was homozygous recessive
Explanation: The results of the test cross yield a 1:1 ratio of round to wrinkled seeds, indicating that the tested individual must be heterozygous…
Correct answer: The tested individual was heterozygous dominant- A. Epistasis
- B. Pleiotropy
- C. Overdominance
- D. Codominance
Explanation: The correct answer is Epistasis. Epistasis involves the interaction of different genes, where the effect of one gene pair masks or alters…
Correct answer: Epistasis- A. Prokaryotes
- B. Protists
- C. Eukaryotes
- D. Fungi
Explanation: Eukaryotes have more DNA than prokaryotes due to their larger, more complex structure, which requires a greater amount of DNA for gene…
Correct answer: Eukaryotes- A. Against A
- B. Against B
- C. Against A and B
- D. Against O
Explanation: The correct answer is 'Against B'. Allele IA indicates the presence of antigen A on the surface of red blood cells.
Correct answer: Against B1035. Blood phenotype AB have:
- A. Anti A antibodies
- B. Anti B antibodies
- C. Both Anti A and B antibodies
- D. Neither anti A nor Anti B antibodies
Explanation: The AB blood phenotype has both A and B antigens on the surface of red blood cells.
Correct answer: Neither anti A nor Anti B antibodies- A. Two alleles
- B. Three alleles
- C. Four alleles
- D. Five alleles
Explanation: The gene I on chromosome 9 is involved in determining the ABO blood group system in humans. It has three alleles: IA, IB, and i.
Correct answer: Three alleles- A. Carry CO2
- B. Carry O2
- C. Release O2
- D. Release CO2
Explanation: Sickle cell hemoglobin, due to its modified β-globin chains, forms an abnormal structure that reduces its ability to carry oxygen (O2)…
Correct answer: Carry O21038. Humans have:
- A. 46 chromosomes
- B. 46 pairs of chromosomes
- C. 23 chromosomes
- D. 22 pairs of chromosomes
Explanation: Humans have a total of 46 chromosomes, which are organized into 23 pairs.
Correct answer: 46 chromosomes- A. Marshall Nirenberg
- B. Philip Leader
- C. Har Gobind Khorana
- D. Marshall Nirenberg, Philip Leader, and Har Gobind Khorana
Explanation: The correct answer is that Marshall Nirenberg, Philip Leader, and Har Gobind Khorana together conducted experiments involving the…
Correct answer: Marshall Nirenberg, Philip Leader, and Har Gobind Khorana1040. ABO blood system has:
- A. Two different phenotypes
- B. Four different phenotypes
- C. Three different phenotypes
- D. Five different phenotypes
Explanation: The ABO blood group system is characterized by four different phenotypes: A, B, AB, and O.
Correct answer: Four different phenotypes