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Question-1 How many pairs of contrasting characters in pea plant are chosen by Mendel?

(A) 2	(B)3
(C)4	(D)7

Question-2
In case of incomplete dominance, what will be the phenotypic ratio of F₂ generation ?

(A) 3 : 1	(B) 1 : 2 : 1
(C) 1 : 1 : 1 : 1	(D) 2 : 2

Question-3 The 1 : 2 : 1 ratio among pink flowers indicates the phenomenon of

(A) linkage	(B)dominance
(C)dihybrid cross	(D)incomplete dominance

Question-4 In F₂-generation, how many types of seeds were obtained by Mendel in his original work?

(A) One type	(B)two types
(C)four types	(D)seven types

Question-5
A dihybrid for qualitative trait is crossed with homozygous recessive individual of its type, the phenotypic ratio is .

(A) 1 : 2 : 1	(B) 3 :1
(C) 1 : 1 : 1 : 1	(D) 9 : 3 : 3 : 1

Question-6
The genotype of a plant showing the dominant phenotype can be determined by .

(A) Test cross	(B) Dihybrid cross
(C) Pedigree analysis	(D) Back cross

Question-7
In which one of the following , complementary gene interaction ratio of 9 : 7 is observed ?

(A) Fruit shape in Shepherd's purse	(B) Coat colour in mouse
(C) Feather colour in fowl	(D) Flower colour in pea

Question-8
Genes exhibiting multiple effects are known as

(A) complementary genes	(B) pleiotropic genes
(C) cistrons	(D) pseudogenes

Question-9
When two hybrids rrTt and Rrtt are crossed, the phenotype ratio of offspring would be .

(A) 3 : 1	(B) 9 : 3 : 3 : 1
(C) 1 : 1	(D) 1 : 1 : 1 : 1

Question-10 The polygenic genes show different

(A) genotypes	(B)phenotypes
(C)karyotypes	(D)none of these

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Plus 1 Biology Science

Tamil Nadu (English Medium)

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