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
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-2 An externally observable characters of an individual are called

(A) phenotype	(B)genotype
(C)homozygous	(D)heterozygous

Question-3
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-4
Genes exhibiting multiple effects are known as

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

Question-5
Which of the following represent a test cross ?

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

Question-6
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-7 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-8 Which of the following is a recessive trait in garden pea?

(A) tall stem	(B)round seeds
(C)wrinkled seeds	(D)coloured seed coat

Question-9 The phenomenon, where a phenotype intermediate to the dominant and recessive type is obtained, is called

(A) mixed dominance	(B)major dominance
(C)complete dominance	(D)incomplete dominance

Question-10 If hybrid red flowered plants of pea are crossed back to pure red flowered parent plant, the progeny will show.

(A) all red flowered plants	(B)all white flowered plants
(C)3 red and 1 white flowered plants	(D)50% red and 50% white flowered plants

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Plus 1 Biology Science

Tamil Nadu (English Medium)

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