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 59 of 62
- A. The recipient's RBCs are destroyed
- B. Either recipient's or donor's RBCs or both are destroyed
- C. The donor's RBCs are destroyed
- D. No RBCs are destroyed
Explanation: Incompatible blood transfusions occur when the blood type of the donor and recipient do not match properly, leading to an immune response.
Correct answer: Either recipient's or donor's RBCs or both are destroyed- A. 23 autosomes, one pair of sex chromosomes
- B. 22 autosomes, one pair of sex chromosomes
- C. 23 pairs of autosomes, one pair of sex chromosomes
- D. 22 pairs of autosomes, one pair of sex chromosomes
Explanation: Humans have a total of 46 chromosomes, organized into 23 pairs. Out of these, 22 pairs are known as autosomes, and they are the same in…
Correct answer: 22 pairs of autosomes, one pair of sex chromosomes1163. In humans:
- A. Same type of gametes are produced
- B. Same type of sperms are produced
- C. Same type of eggs are produced
- D. Different type of eggs are produced
Explanation: In humans, gamete production differs between males and females. Males produce two types of sperm - one carrying the X chromosome and the…
Correct answer: Same type of eggs are produced- A. Allelomorphs
- B. Fixed alleles
- C. Multiple alleles
- D. Pseudoalleles
Explanation: The correct answer is Multiple alleles. This term describes a scenario where a gene has more than two variants or forms in a population.
Correct answer: Multiple alleles- A. Charles Darwin
- B. Nilsson-Ehle
- C. Gregor Mendel
- D. Carl Correns
Explanation: Nilsson-Ehle studied the genetics of wheat grain color and demonstrated that it is a polygenic trait.
Correct answer: Nilsson-Ehle- A. Two to three gene pairs
- B. Three to four gene pairs
- C. Four to five gene pairs
- D. Three to six gene pairs
Explanation: Human skin color is a quantitative trait influenced by three to six gene pairs.
Correct answer: Three to six gene pairs- A. Alleles of two or more different gene pairs
- B. Alleles of a single gene pair
- C. Alleles of two or more genomes
- D. Multiple alleles of a single gene
Explanation: A continuously varying trait, also known as a quantitative trait, is typically influenced by alleles of two or more different gene pairs…
Correct answer: Alleles of two or more different gene pairs- A. Robert Hook
- B. Robert Brown
- C. Gregor Mendel
- D. Charless Darwin
Explanation: Gregor Mendel established the basic laws of inheritance through controlled breeding experiments with pea plants, earning him the title…
Correct answer: Gregor Mendel- A. Leptotene
- B. Pachytene
- C. Diplotene
- D. Zygotene
Explanation: Leptotene is the first stage of the prophase of meiosis, during which each chromosome becomes visible as two fine threads.
Correct answer: Pachytene- A. Gamete formation
- B. Recombination during cell division
- C. Production of enzymes during cell division
- D. Chromosomal movement towards pole
Explanation: The synaptonemal complex plays a crucial role in several processes related to cell division, particularly during meiosis, which is the…
Correct answer: Recombination during cell division- A. Replication
- B. Recombination
- C. Gene mapping
- D. None of these
Explanation: Option A: Replication refers to the process of DNA replication that occurs before cell division.
Correct answer: Gene mapping- A. Homozygous dominant
- B. Heterozygous
- C. Homozygous recessive
- D. None of these
Explanation: Pattern baldness is a sex influenced trait. It is inherited as an autosomal dominant trait in males but as an autosomal recessive trait in…
Correct answer: Homozygous recessive- A. A and AB
- B. A and B
- C. A and O
- D. None of these
Explanation: a) A and AB:If one parent has blood type A and the other parent has blood type AB, it is possible for their children to have different…
Correct answer: A and B- A. Incomplete dominance
- B. Codominance
- C. Epistasis
- D. Crossing over
- E. Linkage
Explanation: Explanation for this question will be added soon.
Correct answer: Incomplete dominance- A. 3 : 1
- B. 9 : 3 :3 : 1
- C. 12 : 3 : 1
- D. 9 : 3 : 4
- E. 12 : 9 : 3 : 1
Explanation: Explanation for this question will be added soon.
Correct answer: 9 : 3 : 4- A. 3:1
- B. 1:3
- C. 1:1
- D. All short
- E. All tall
Explanation: Explanation for this question will be added soon.
Correct answer: All tall- A. Complete dominance
- B. Codominance
- C. Partial dominance
- D. All of these
Explanation: Complete dominance is a form of dominance wherein the dominant allele completely masks the effect of the recessive allele in heterozygous…
Correct answer: Partial dominance- A. 1
- B. 2
- C. 3
- D. 4
Explanation: The trait of kernel colour in corn is controlled by three pairs of genes.
Correct answer: 31179. When a haemophilic carrier woman marries a normal man, who among her offspring may be affected?
- A. All her children
- B. All her daughters
- C. Half of her sons
- D. None of these options
Explanation: Haemophilic female = XH Xh Normal male= XH Y Referring to the Punnett square, Half of daughters are affected as a carrier of haemophilia…
Correct answer: Half of her sons- A. 25%
- B. 50%
- C. 75%
- D. 100%
Explanation: Haemophilia is a sex-linked recessive disorder, usually an inherited bleeding disorder in which the blood does not clot properly.
Correct answer: 50%