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 The transmission of certain genetic information from parents to offsprings through cytoplasm is termed as

(A) transformation	(B)transduction
(C)transversion	(D)cytoplasmic inheritance

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

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

Question-3 The polygenic genes show different

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

Question-4
Which one of the follwoing cannot be explained on the basis of Mendel's Law Dominance ?

(A) The discrete unit controlling a particular character is called a factor	(B) Out of one pair of factors one is dominant, and the other is recessive
(C) Alleles do not show any blending and both the characters recover as such in F₂ generation	(D) Factors occur in pairs

Question-5 The genes controlling the seven pea characters studied by Mendel are now known to be located on how many different chromosomes?

(A) six	(B)five
(C)four	(D)seven

Question-6 How many pairs of contrasting characters in pea plant are chosen by Mendel?

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

Question-7 Mirabilis jalapa is an example of

(A) Complete dominance	(B)supplementary gene
(C)incomplete dominance	(D)complementary gene

Question-8 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

Question-9
Which of the following represent a test cross ?

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

Question-10
Which of the following is best suited for codominance ?

(A) Both are recessive	(B) Both are dominance
(C) One is recessive	(D) One is dominance

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Plus 1 Biology Science

Tamil Nadu (English Medium)

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