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Solved Examples on Heredity and Variation

Question1: 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

Answer: 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.

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Question2: Blood groups are named because of the agglutinogen A and B present in [CPMT 1992, 93]

(a)      Plasma         

(b)      RBC  

(c)       WBC 

(d)      Platelet

Answer: b

Solution:

Blood groups are named because of the agglutinogen A and B present in RBC.

Question3: 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...

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