Tamil Nadu (English Medium) Plus 1 Biology Science Study Materials, Online Learning, Question Papers, Classnotes, Practice Test, MCQ | Smartindia Educational Program : www.smartindia.net.in

Question-1
Which of the following represent a test cross ?

(A) Ww × WW	(B) Ww × Ww
(C) Ww × ww	(D) WW × WW

Question-2
Which traits of garden pea studied by Mendel was a recessive feature?

(A) green seed colour	(B) green pod colour
(C) round seed shape	(D) axial flower position

Question-3
A character , which is expressed in a hybrid is called

(A) dominant	(B) recessive
(C) co-dominant	(D) epistatic

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 The polygenic genes show different

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

Question-6
Lack of independent assortment of two genes 'A' and 'B' in fruit fly Drosophila is due to

(A) repulsion	(B) recombination
(C) linkage	(D) crossing over

Question-7 The organisms phenotypically similar but genotypically different are said to be

(A) multizygous	(B)homozygous
(C)heterozygous	(D)monozygous

Question-8
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-9
To determine heterozygosity of a cross, one has to perform

(A) back cross	(B) reciprocal cross
(C) test cross	(D) any of these

Question-10 How many pairs of contrasting characters in pea plant are chosen by Mendel?

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

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Plus 1 Biology Science

Tamil Nadu (English Medium)

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