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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]
(d) None of the above
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]
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
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.