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.
Last updated
Read the Inheritance notesFree MDCAT chapter notes with key terms1,238 questions · page 24 of 62
- A. Heterogametic male
- B. Homogametic female
- C. Heterogametic female
- D. Homogametic male
Explanation: In humans, the sex is determined by the heterogametic male, who have the XY chromosome, while the female have the XX chromosome.
Correct answer: Heterogametic male- A. Homozygous recessive
- B. Homozygous dominant
- C. Heterozygous
- D. Heterozygous dominant
Explanation: It will be heterozygous since the alleles are of 2 types and it will be dominant since the dominant traits are shown in heterozygotes
Correct answer: Heterozygous dominant- A. X-linked dominant
- B. X-linked recessive
- C. Autosomal recessive
- D. Autosomal dominant
Explanation: The father transmits his "X-chromosome" to the daughter while the sons receive "Y-chromosome" from the father.
Correct answer: X-linked dominant- A. His mother only
- B. Part from his father and part from his mother
- C. His father only
- D. Either his mother or his father, It depends upon luck
Explanation: Biologically male people always inherit their X chromosome from their mother, and Y chromosome from their father.
Correct answer: His mother only- A. Trait
- B. Phenotype
- C. Allele
- D. Genotype
Explanation: The alternative form of a gene is called an allele. An individual inherits two alleles one from each parent.
Correct answer: Allele- A. 1/8
- B. 1/4
- C. 1/32
- D. 1/16
Explanation: d) 1/16 Explanation: This option suggests that 1/16 of the offspring will display both recessive phenotypes for the two traits.
Correct answer: 1/16- A. Homozygous tall x Heterozygous tall
- B. Heterozygous tall x Heterozygous tall
- C. Homozygous tall x Homozygous tall
- D. Pure short x Pure short
- E. Homozygous tall x Pure short
Explanation: The law of dominance is illustrated by the cross between homozygous tall and pure short garden pea.
Correct answer: Homozygous tall x Pure short- A. The Male is larger with a pointed abdomen
- B. The female has sex combs on its front legs
- C. It has a generation time of just eight weeks
- D. Salivary gland cells have giant chromosomes in their nuclei
Explanation: Polytene chromosomes form in the Drosophila giant salivary gland during development by multiple rounds of genome replication without cell…
Correct answer: Salivary gland cells have giant chromosomes in their nuclei- A. A,O
- B. O,A
- C. B, O
- D. B, A
Explanation: The father can pass on either the A or B allele to each of his offspring.
Correct answer: O,A- A. 25%
- B. 50%
- C. 75%
- D. 100%
Explanation: Given that that man's father was Rh-negative and man is Rh-positive,the man must be heterozygous for Rh-positive.
Correct answer: 50%- A. X
- B. I
- C. Y
- D. O
Explanation: The gene for ABO blood group systems is represented by I, with the three alleles being IA, IB, and i.
Correct answer: I- A. 25%
- B. 50%
- C. 75%
- D. 1%
Explanation: The correct answer is 25%. Carriers are heterozygotes. In the case of recessive inheritance, a carrier will not know that they are…
Correct answer: 25%- A. 40%
- B. 50%
- C. 75%
- D. 100%
Explanation: Penetrance is the extent to which a particular gene or set of genes is expressed in the phenotypes of individuals carrying it.
Correct answer: 100%- A. Eye Colour
- B. Skin Colour
- C. ABO-Blood Group
- D. Rh-Blood Group
Explanation: The human ABO blood type is a good example of multiple alleles. Humans can have red blood cells that are of type A (IA), type B (IB), or…
Correct answer: ABO-Blood Group- A. Hypophospatemic Rickets
- B. Color Blindness
- C. Baldness
- D. Beard Growth
Explanation: The gene responsible for color blindness is located on the X chromosome.
Correct answer: Color Blindness- A. Heterogametic
- B. Homogametic
- C. Isogametic
- D. Isomorphic
Explanation: The sex of the offspring depends on the parent who is heterogametic(XY) i.e. the father.
Correct answer: Heterogametic- A. Epistasis
- B. Pleiotropy
- C. Dominance
- D. Over dominance
Explanation: Pleitropy is a phenomenon, when a single gene affects apparently unrelated phenotypic traits.
Correct answer: Pleiotropy- A. Two dominant alleles
- B. One dominant allele
- C. One recessive allele
- D. Two recessive alleles
Explanation: Option D is correct as genetic disorder that is recessive the person needs "two recessive alleles" otherwise the gene won't express itself…
Correct answer: Two recessive alleles- A. Genotype
- B. Phenotype
- C. Recombinant
- D. Replication
Explanation: A phenotype is an individual's observable traits, such as height, eye color, and blood type.
Correct answer: Phenotype- A. Fruit fly
- B. Protenor bug
- C. Butterfly
- D. All of them
Explanation: Male is XO because it has only one X chromosome. The other sex chromosomes are missing entirely.
Correct answer: Protenor bug