Solved Examples: Heredity & Variation - NEET PDF Download

Q.1. If two genes are present at the same locus and after interacting with each other produce different effect are called     [CBSE PMT 2001]
(a) Codominance
(b) Dominance
(c) Epistasis    
(d) None of the above
Ans: a
Solution:
In co-dominance both the gene expressed for a particular character in F1 hybrid progeny. There is no blending of characters, whereas both the characters are expressed equally.

Q.2. Blood groups are named because of the agglutinogen A and B present in     [CPMT 1992, 93]
(a) Plasma        
(b) RBC  
(c) WBC
(d) Platelet
Ans: b
Solution:
Blood groups are named because of the agglutinogen A and B present in RBC.

Q.3. A normal woman whose father was albino marries an albino; what proportion of normal and albino can be expected among their offspring [CBSE PMT1994]
(a) All albino    
(b) One normal : one albino          
(c) All normal  
(d) Two normal : one albino
Ans: b
Solution:
The normal woman got one recessive albino gene from her father, and one normal pigment gene from her mother. The man she married has two albino genes. 50% of their offspring will have two albino genes, and will be albino themselves. 50% of their offspring will appear normal, with one normal pigment gene, and one recessive albino gene.