1. A tall plant on selfing produce tall and dwarf both What are the probabilities that first offspring will be ?
( A ) tall
( B ) dwarf
( C ) equal chance
( D ) data not sufficient
ANS-( A )
2. Offspring of which of the following crosses are all phenotypically alike ?
( A ) Dd x Dd
( B ) Dd x dd
( C ) DD x Dd
( D ) Ww x Ww
ANS-( C )
3. A test cross of AaBbCC produces how many phenotypes ?
( A ) 16
( B ) 12
( C ) 8
( D ) 4
ANS-( D )
4. Which one of the following individuals can produce 16 different gametes ?
( A ) Aa Bb cc Dd
( B ) Aa Bb cc DD Ee Ff
( C ) Aa Bb Cc dd EE FF
( D ) Aa Bb Cc DD Ee FF
ANS-( B )
5. Which is pure hybrid in the following ?
( A ) Rrtt
( B ) TTrr
( C ) TtRr
( D ) TTRR
ANS-( C )
6. Which one of the following crosses shows 3 : 1 ratio ?
( A ) AaBb x AaBb
( B ) aabb × AABb
( C ) Aabb × Aabb
( D ) AaBb x aabb
ANS-( C )
7. ABO blood group in humans is an example of
( A ) Polygenic inheritance
( B ) Multifactor inheritance
( C ) Pleiotrople gene
( D ) Multiple alleles
ANS-( D )
8. Genotype of A – group father and of O – group child would be :
( A ) IA IA
( B ) IA i
( C ) IA I B
( D ) ii
ANS-( B )
9. An O – group child can not have parents of blood groups :
( A ) B and B
( B ) A and B
( C ) O and O
( D ) AB and O
ANS-( D )
10. A recessive trait in Garden Pea is :
( A ) Tall stem
( B ) Coloured flower
( C ) Wrinkled seed
( D ) Inflated pod
ANS-( C )
11. Dihybrid test cross is :
( A ) 1 : 1 : 1 : 1
( B ) 1 : 1
( C ) 9 : 3 : 3 : 1
( D ) 15 : 1
ANS-( A )
12. A couple has two girls . The probability of a third girl baby is :
( A ) 100 %
( B ) 50 %
( C ) 25 %
( D ) 12.5 %
ANS-( B )
13. Genes present on the same locus but having different expressions are :
( A ) Multiple alleles
( B ) Polygenes
( C ) Oncogenes
( D ) Co – dominants
ANS-( A )
14. How many kinds of gemetes will be produced by AA Bb cc genotype ?
( A ) Two
( B ) Four
( C ) Six
( D ) Nine
ANS-( A )
15. Phenotypic ratio of monohybrid F1 progeny of an incomplete dominance is
( A ) 1 : 1 : 1 : 1
( B ) 1 : 2 : 1
( C ) 3 : 1
( D ) 2 : 1 : 2
ANS-( B )
16. Sickle cell anaemia shows :
( A ) Epistasis
( B ) Co – dominance
( C ) Pleiotropy
( D ) Incomplete dominance
ANS-( C )
17. G.J. Mendel was :
( A ) British monk
( B ) Australian monik
( C ) Austrian monk
( D ) German scientist
ANS-( C )
18. Ultimate source of variation is :
( A ) Mitosis
( B ) Hybridisation
( C ) Fertilization
( D ) Mutations
ANS-( D )
19. A monohybrid cross produced tall and dwarf Pea plants in ratio of 3 : 1. Their genotypes would be :
( A ) TT × Tt
( B ) Tt x Tt
( C ) TT x tt
( D ) Tt x H
ANS-( B )
20. Individuals with blood group A has
( A ) Antigen A , antibody B
( B ) Antigen B , antibody A
( C ) Antigen A , antibody b
( D ) Antigen A , no antibody
ANS-( C )
