Class 12 Biology MCQs Chapter – 5
81. cross between offspring and recessive parent is
( A ) Monohybrid cross
( B ) Back cross
( C ) Test cross
( D ) Reciprocal cross
ANS-( C )
82. Common test to find genotype of hybrid is by :
( A ) Studying sexual behaviour of F1 progeny
( B ) Crossing F1 individuals with recessive parents
( C ) Crossing one F2 progeny.with male parents
( D ) Crossing one F2 progeny with female parent
ANS-( B )
83. Segregation of genes occurs in :
( A ) Embryo formation
( B ) Anaphase I
( C ) Anaphase
( D ) Metapliase
ANS-( B )
84. Offspring produced from a cross between two pure individuals differering in one set of characters is called :
( A ) Monohybrid
( B ) Mutant
( C ) Polyploid
( D) Variant
ANS-( A )
85. Test Cross is performed to known the genotype . It is a cross between
( A ) F1 hybrid with dominant parent
( B ) F1 hybrid with recessive parent
( C ) Two F1 hybrids
( D ) Two F2 hybrids
ANS-( B )
86. A cross between hybrid and either of any parent is called :
( A ) test cross
( B ) reciprocal cross
( C ) Monohybrid cross
( D ) back cross
ANS-( D )
87. To see the effect of sex on inheritance , Mendal performed :
( A ) test cross
( B ) out cross
( C ) reciprocal cross
( D ) sib cross
ANS-( C )
88. A cross between F hybrid with the dominant parent is called :
( A ) Test cross
( B ) out cross
( C ) back cross
( D ) reverse cross
ANS-( B )
89. A dominant trait in the following is :
( A ) Colourblindness
( B ) Night blindness
( C ) RH
( D ) Albinism
ANS-( C )
90. Independent assortment of Mendal was :
( A ) Monohybrid cross
( B ) Dihybrid cross
( C ) Incomplete dominance
( D ) Back cross
ANS-( B )
91. IF Mendel has considered eighth trait in pea , which law would have failed ?
( A ) Law of segregation
( B ) Law of Purity of gametes
( C ) Law of independent
( D ) Law of dominance
ANS-( C )
92. An exception to Mendelian Law of independent assortment is :
( A ) Crossing over
( B ) Incomplete dominance
( C ) Segregation
( D ) Linkage
ANS-( D )
93. Who modified Mendel’s postulates as Mendel’s laws ?
( A ) Correns
( B ) Tschermark
( C ) Hugo de Vries
( D ) Morgan
ANS-( A )
94. In incomplete dominance in F2 generation :
( A ) ratio of phenotype is 3 : 1
( B ) ratio of genotype is 3 : 1
( C ) both ( A ) and ( B )
( D ) phenotypic ratio corresponds to genotypic ratio
ANS-( D )
