Q.6 When the presence of a gene at one locus suppresses the effect of a gene at another locus, the
phenomenon is called
A) Hypostasis C) Epistasis
B) Pleiotropy D) Epitropy
Q.7 The gene for ABO-blood group systems in humans is represented by symbol:
A) X C) Y
B) I D) O
Q.8 When a single gene affects two or more traits, the phenomenon is called
A) Epistasis C) Dominance
B) Pleiotropy D) Over dominance
Q.9 The comparative embryology of all vertebrates shows development of
A) Hairs C) Scales
B) Gill pouches D) Fins
Q.10 In men, sex-determination depends upon the nature of
A) Heterogametic male C) Heterogametic female
B) Homogametic female D) Homogametic male