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 60 of 62
- A. Haemophilia
- B. Colour blidness
- C. Hypophosphatemic ricket
- D. TFM syndrome
Explanation: Hypophosphatemic rickets is an X-linked dominant trait in which excessive loss of phosphate in the urine leads to poorly formed bones…
Correct answer: Hypophosphatemic ricket- A. 1.0
- B. 0.75
- C. 0.50
- D. 0.25
Explanation: Males have 1 X chromosome and 1 Y chromosome, and females have 2 X chromosomes.
Correct answer: 0.50- A. Homozygous
- B. Hemizygous
- C. Heterozygous
- D. Incomplete dominance
Explanation: Hemizygous means having only a single copy of a gene instead of the customary two copies.
Correct answer: Hemizygous- A. False: Females can't have haemophilia
- B. False: Haemophilia wasn't diagnosed until then
- C. True: Females can have haemophilia if both the mother and father were affected
- D. True: Females can have haemophilia if any of the parent were affected
- E. None of the answers are correct
Explanation: Explanation for this question will be added soon.
Correct answer: True: Females can have haemophilia if both the mother and father were affected- A. 0%
- B. 25%
- C. 50%
- D. 100%
Explanation: X chromosome comes from the female and X or Y comes from the man. if the man is normal then the disease will not express in the daughter.
Correct answer: 0%1186. Which of the following traits is transmitted directly from an affected father to only his son?
- A. Autosomal
- B. X-linked
- C. Y-linked
- D. X-Y linked
Explanation: Y-linked traits are passed from father to son through the Y chromosome.
Correct answer: Y-linked- A. Phenotype.
- B. Junction.
- C. Locus.
- D. Genotype.
Explanation: A locus is the specific physical location of a gene or other DNA sequence on a chromosome, like a genetic street address.
Correct answer: Locus.- A. Six
- B. Four
- C. Five
- D. Five or three
Explanation: Three different gene pairs at three different loci contribute to the wheat grain color.
Correct answer: Six- A. It is autosomal recessive disease in males
- B. It is X-linked disease
- C. It is autosomal dominant disease in males
- D. It is Y-linked disease
Explanation: Explanation:It is a autosomal dominant disease in males, but it is sex influenced character as a result a female heterozygous for this…
Correct answer: It is autosomal dominant disease in males- A. Alleles of a gene
- B. Two different genes at the same locus
- C. Two contrasting traits
- D. Two different genes at different loci
Explanation: [A] Epistasis not linked to alleles of genes[B] Two different genes are at the different loci[C] Two contrasting traits are two different…
Correct answer: Two different genes at different loci- A. Pleiotropic
- B. Epistatic
- C. Dominant
- D. Mutant
Explanation: Pleiotropy is defined as the expression of multiple traits by a single gene.
Correct answer: Pleiotropic- A. Locus
- B. Origin
- C. Amplicon
- D. Filial
Explanation: The position of genes on a chromosome is known as locus.
Correct answer: Locus- A. Codominance
- B. Dominance-recessive relationship
- C. Incomplete dominance
- D. Over dominance relationship
Explanation: The round phenotype is due to the presence of the dominant allele which expresses itself regardless of the presence of the recessive…
Correct answer: Dominance-recessive relationship- A. Chromosomal aberration
- B. Aneuploidy
- C. Point mutation
- D. Euploidy
Explanation: All these mutations revolve around a single nucleotide being replaced, inserted or deleted hence the term 'point'.
Correct answer: Point mutation- A. Dominance
- B. Incomplete dominance
- C. Codominance
- D. Over-dominance
Explanation: Incomplete dominance is when a dominant allele, or form of a gene, does not completely mask the effects of a recessive allele, and the…
Correct answer: Incomplete dominance- A. Dominance
- B. Codominance
- C. Pleiotropy
- D. Epistasis
Explanation: Epistasis is an example of nonallelic interactions. It is defined as the phenomenon in which the effect caused by genes on one locus…
Correct answer: Epistasis- A. 3/16 Tall-round ; 3/16 dwarf-wrinkled
- B. 9/16 Tall-wrinkled ; 3/16 dwarf-round
- C. 9/16 Tall-round ; 3/17 Dwarf-round
- D. 3/16 Tall-wrinkled ; 3/16 Dwarf-round
Explanation: As we talk about the F1 generation, we can assume them to be heterozygous for both characteristics.
Correct answer: 3/16 Tall-wrinkled ; 3/16 Dwarf-round- A. ¼ purple ; ¾ white
- B. ¼ white ; ¾ purple
- C. All white
- D. All purple
Explanation: As it is mentioned in the question that it is pure breeding, we can assume the pea plants involved in the breeding to be homozygous…
Correct answer: All purple1199. In moths male is _.
- A. Heterogametic
- B. Dieogametic
- C. Homogametic
- D. Both B and C
Explanation: Moths and butterflies, have a female heterogametic sex chromosome system, with most females having a ZW constitution while males are ZZ.
Correct answer: Homogametic- A. X-linked
- B. Autosomal
- C. Y-linked
- D. X and Y-linked
Explanation: [A] X-linked traits are not only transmitted from father to son but can be also transmitted to her daughter[B] Autosomal disease can be…
Correct answer: Y-linked