Free Inheritance MCQs with Answers

• A. b, a, c
• B. a, b, c
• C. a, c, b
• D. None of these options are correct

Explanation: Based on your assertion, option "a. b, a, c" is considered the correct answer.

• A. It expresses it's effect only in homozygous state.
• B. It expresses it's effect only in heterozygous condition.
• C. It expresses it's effect both in homozygous and heterozygous condition.
• D. It never expresses it's effect in any condition.

Explanation: A gene is considered dominant when its effect is expressed both in homozygous and heterozygous conditions.

• A. Down's syndrome, 21 st chromosome
• B. Sickle cell anaemia, X-­chromosome
• C. Haemophilia, Y­-chromosome
• D. Parkinson's disease, X and Y chromosome.

Explanation: The correct match is "a. Down's syndrome - 21st chromosome." Down's syndrome is caused by the presence of an extra copy of chromosome 21…

• A. Epistasis
• B. Polygene
• C. Non-complementary gene
• D. Complementary gene

Explanation: The correct term for the described scenario where two nonallelic genes produce a new phenotype when present together but fail to do so…

• A. Co­-dominance
• B. Dominance
• C. Amphidominance
• D. Pseudo dominance

Explanation: Co-dominance is the correct term for the expression of both dominant and recessive alleles in a heterozygous individual, resulting in the…

• A. 9 : 3 : 4
• B. 12 : 3 : 1
• C. 9 : 3 : 3 : 4
• D. 9 : 7

Explanation: The ratio of complementary genes is 9 : 7 (option d). Complementary gene interaction occurs when two different genes work together, and…

• A. Genes are located on homologous chromosomes
• B. Genes are linked and located on same chromosome
• C. Genes are located on non­-homogenous chromosome
• D. All of these

Explanation: Independent assortment of genes occurs when genes are located on different chromosomes and segregate independently during meiosis.

• A. Change of amino acid in a­-chain of haemoglobin
• B. Change of amino acid in b­-chain of haemoglobin
• C. Change of amino acid in both a and b chains of haemoglobin
• D. Change of amino acid either a or b chains of haemoglobin

Explanation: B is is the correct option. Sickle cell anemia is caused by a point mutation in the b-chain of hemoglobin, where the amino acid glutamic…

• A. 1
• B. 2
• C. 3
• D. 4

Explanation: C is is the correct answer. In individuals with quadruple X chromosomes (XXXX), three of the X chromosomes are inactivated, resulting in…

• A. 50%
• B. 75%
• C. 25%
• D. 100%

Explanation: When you cross TTRr (tall and red-flowered) with ttrr (short and non-red-flowered), 50% of the resultant progenies will be tall and…

• A. Terminal position of flower
• B. Green colour in seed coat
• C. Wrinkled seeds
• D. Green pod colour

Explanation: In Mendel's experiments, the concept of dominance is observed in traits such as seed coat color and pod color.

• A. In human beings Y chromosme is active in sex determination.
• B. Y chromosome is active in sex determination in both human beings and Drosophila.
• C. In Drosophila Y chromosome decides femaleness.
• D. Y chromosome of man have genes for syndrome.

Explanation: The different outcomes of the XXY condition in Drosophila and human beings demonstrate that the mechanisms of sex determination are…

• A. Dominance
• B. Segregation
• C. Epistasis
• D. Mutation

Explanation: Epistasis is the phenomenon where a gene at one locus (epistatic gene) can hide or modify the effects of a gene at another locus…

• A. Colour blind sons and 50% carrier daughter
• B. 50% colourblind sons and 50% carrier daughter
• C. Normal males and carrier daughters
• D. Colour blind sons and carrier daughters

Explanation: In the standard Mendelian pattern, a marriage between a normal-visioned man and a color-blind woman results in sons with normal vision and…

• A. During pregnancy
• B. In a test tube
• C. Through transfusion
• D. Both A and C

Explanation: The problem due to the Rh factor arises when the blood of individuals with different Rh statuses (Rh+ and Rh-) mixes, leading to Rh factor…

• A. Sickle-­cell anaemia
• B. Skin colour
• C. Colour blindness
• D. Phenylketonuria

Explanation: Inheritance of complex traits in human beings often involves the influence of multiple genes.

• A. Pseudodominance
• B. Pleiotropy
• C. Epistasis
• D. None of these.

Explanation: Pleiotropy is the term used when a single gene has multiple effects on an organism's phenotype, influencing various traits.

• A. Segregation of alleles
• B. Recombination of linked alleles
• C. Dominance of genes
• D. Linkage between genes

Explanation: Crossing over in diploid organisms is a fundamental mechanism that enables the recombination of linked alleles.

• A. Six
• B. Nine
• C. Two
• D. Four

Explanation: For the provided genotype AABbCc, which indicates homozygosity at all three gene loci, there are only four genetically different gametes…

• A. 50% haemophilic colour­blind sons and 50% normal sons
• B. 50% haemophilic daughters (carrier) and 50% colour blind daughters (carrier)
• C. All sons and daughters haemophilic and colour­blind
• D. Haemophilic and colour­blind daughters

Explanation: When a woman with two genes for hemophilia and one gene for color blindness on one of her X chromosomes marries a normal man, their…