Free Inheritance MCQs with Answers

• A. Pink color
• B. Light red color
• C. Red color
• D. Dark red color

Explanation: Nilsson-Ehle studied the genetics of wheat grain color. When he crossed a true breeding dark red grain plant with true breeding white…

• A. 1:6:15:20:15:6:1
• B. 1:2:3:04:03:2:1
• C. 3:6:9:12:9:6:3
• D. 5:10:15:20:15:10:5

Explanation: Nilsson - Ehle studied the genetics of wheat grain color. When he crossed a true breeding dark red grain plant with true breeding white…

• A. One
• B. Two
• C. Three
• D. Four

Explanation: Alleles A, B and C code for equal amount (dose) of red pigment, which is a positive effect. But none of a, b, and c code red pigment.

• A. Three gene pairs
• B. Three to four gene pairs
• C. Three to five gene pairs
• D. Three to six gene pairs

Explanation: Human skin color is also a quantitative trait which is controlled by three to six gene pairs.

• A. Extreme phenotypes
• B. Any phenotype
• C. Intermediate phenotype
• D. Strange phenotype

Explanation: It is evident from the ratio obtained by Nilsson-Ehle in F2 i.e: 1 : 6 : 15 : 20 : 15 : 6 : 1.

• A. Alleles of two or more different gene pairs
• B. Alleles of a gene pair
• C. Alleles of two or more genomes
• D. Multiple alleles of two or more different gene pairs

Explanation: A continuously varying trait is encoded by two or more different gene pairs found at different loci all influencing the same trait in an…

• A. Human intelligence
• B. Skin color in humans
• C. Grain color of wheat
• D. 4 O'clock flower color

Explanation: Human intelligence, human skin color and grain color of wheat are continuously varying polygenic traits however flower color in four O…

• A. Dominance
• B. Over dominance
• C. Co-dominance
• D. Incomplete dominance

Explanation: If two contrasting traits are completely expressed in heterozygous condition, then it is called co dominance.

• A. Rh+ man and Rh+ woman
• B. Rh+ man and Rh- woman
• C. Rh- man and Rh- woman
• D. Rh- man and Rh+ woman

Explanation: Rh factor plays a crucial role in a child's birth born out of a marriage between Rh- woman and a Rh+ man.

• A. No antigen
• B. No antibody
• C. Neither antigen nor antibody
• D. Both antigen and antibody

Explanation: Therefore, the correct answer to the question "Blood group AB has" is B) No antibody.

• A. O
• B. B
• C. A
• D. AB

Explanation: Blood group A - has A antigens on the red blood cells with anti-B antibodies in the plasma.

• A. No antigens but both A and B antibodies are present
• B. A antigen and B antibody present
• C. Antigen and antibody both absent
• D. A, B antigens and A, B antibodies present

Explanation: Blood group O has no antigens, but both anti-A and anti-B antibodies in the plasma.

• A. Type B
• B. Type AB
• C. Type O
• D. Type A

Explanation: The universal blood donor. People with blood type O are considered universal donors because their blood lacks A or B antigens on the…

• A. Her mother only
• B. Both her mother and her father
• C. Her father only
• D. Extra nuclear DNA in her mother's egg

Explanation: The woman always have XX chromosome, but the man has XY chromosome, so a child always gets an X chromosome from the mother but if the man…

• A. Inheritance of a condition like phenylketonuria as an autosomal recessive trait
• B. The pedigree chart is incorrect and does not represent a possible inheritance pattern
• C. Inheritance of a recessive sex-linked disease like haemophilia
• D. Inheritance of a sex-linked inborn error of metabolism like phenylketonuria

Explanation: The correct answer is that the pedigree chart shows the inheritance of a condition like phenylketonuria as an autosomal recessive trait.

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

Explanation: Complementary genes are two nonallelic genes that interact in such a way that they produce a new phenotype when present together, but fail…

• A. Change of amino acid in the a-chain of haemoglobin
• B. Change of amino acid in the 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: Sickle cell anemia is a genetic disorder caused by a single nucleotide mutation in the gene encoding the b-chain of hemoglobin.

• A. 9 : 3 : 3 : 1
• B. 2 : 1 : 1 : 2
• C. 1 : 2 : 2 : 1
• D. 7 : 5 : 3 : 1

Explanation: In a cross between AABB × aabb, each parent can only produce one type of gamete: AB from AABB and ab from aabb.

• A. Dominant
• B. Hybrid
• C. Heterozygous
• D. Homozygous

Explanation: The correct answer is Homozygous. An organism is homozygous if it has two identical alleles for a gene, which can be either dominant or…

• A. Dominant-recessive
• B. Incomplete dominance
• C. Hybrid
• D. Supplementary genes

Explanation: The inheritance pattern observed in the cross between red (RR) and white (WW) Antirrhinum, resulting in pink (RW) offspring, is an example…