CHAPTER 3 CHROMOSOMAL BASIS OF INHERITANCE - CLASS 12 BIOLOGY BOTANY - 1 MARK QUESTIONS - ONLINE TEST

ப்ளஸ் டூ படிக்கும் மாணவர்களுக்கு இந்தத் தேர்வு பயனுள்ளதாக இருக்கும். இந்த யூ ட்யூப் தளத்தில் வரும் ஆடியோவை ப்ளே செய்து மீண்டும் மீண்டும் கேளுங்கள். ஆடியோவை கேட்கும் பொழுதே கீழே உள்ள கேள்வி பதில்களை SCROLL செய்து உற்று நோக்குங்கள். பிறகு கேள்விகளில் உள்ள சரியான விடையை தேர்ந்தெடுத்து கடைசியாக SUBMIT செய்யுங்கள். நீங்கள் எடுத்த மதிப்பெண் வரும் அந்த மதிப்பெண்ணை கீழே உள்ள கமெண்ட் பாக்ஸ் இல் பதிவு செய்யுங்கள். மதிப்பெண் குறைந்தால் மீண்டும் ஒருமுறை முயற்சி செய்யுங்கள்... வாழ்த்துக்கள் மாணவர்களே...அன்புடன் - K.K.D.

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1.

An allohexaploidy contains

a) Six different genomes

b) Six copies of three different genomes

c) Two copies of three different genomes

d) Six copies of one genome

2.

The A and B genes are 10 cM apart on a chromosome. If an AB/ab heterozygote is testcrossed to ab/ab, how many of each progeny class would you expect out of 100 total progeny?

a) 25 AB, 25 ab, 25 Ab, 25 aB

b) 10 AB, 10 ab

c) 45 AB, 45 ab

d) 45 AB, 45 ab, 5 Ab, 5aB

3.

Match list I with list II |
➡️ List I :
A. A pair of chromosomes extra with diploid
B. One chromosome extra to the diploid
C. One chromosome loses from diploid
D. Two individual chromosomes lose from diploid
➡️ List II :
i) monosomy.
ii) tetrasomy.
iii) trisomy.
iv) double monosomy

a) A-i, B-iii, C-ii, D-iv

b) A-ii, B-iii, C-iv, D-i

c) A-ii, B-iii, C-i, D-iv

d) A-iii, B-ii, C-i, D-iv

4.

Which of the following sentences are correct?
➡️1. The offspring exhibit only parental combinations due to incomplete linkage
➡️2. The linked genes exhibit some crossing over in complete linkage
➡️3. The separation of two linked genes are possible in incomplete linkage
➡️4. Crossing over is absent in complete linkage

a) 1 and 2

b) 2 and 3

c) 3 and 4

d) 1 and 4

5.

Accurate mapping of genes can be done by three point test cross because increases

a) Possibility of single cross over

b) Possibility of double cross over

c) Possibility of multiple cross over

d) Possibility of recombination frequency

6.

Due to incomplete linkage in maize, the ratio of parental and recombinants are

a) 50:50

b) 7:1:1:7

c) 96.4: 3.6

d) 1:7:7:1

7.

Genes G S L H are located on same chromosome. The recombination percentage is between L and G is 15%, S and L is 50%, H and S are 20%. The correct order of genes is

a) GHSL

b) SHGL

c) SGHL

d) HSLG

8.

The point mutation sequence for transition, transition, transversion and transversion in DNA are

a) A to T, T to A, C to G and G to C

b) A to G, C to T, C to G and T to A

c) C to G, A to G, T to A and G to A

d) G to C, A to T, T to A and C to G

9.

If haploid number in a cell is 18. The double monosomic and trisomic number will be

a) 34 and 37

b) 34 and 35

c) 37 and 35

d) 17 and 19

10.

Changing the codon AGC to AGA represents

a) missense mutation

b) nonsense mutation

c) frameshift mutation

d) deletion mutation

11.

➡️Assertion (A): Gamma rays are generally use to induce mutation in wheat varieties.
➡️Reason (R): Because they carry lower energy to non-ionize electrons from atom

a) A is correct. R is correct explanation of A

b) A is correct. R is not correct explanation of A

c) A is correct. R is wrong explanation of A

d) A and R is wrong

12.

How many map units separate two alleles A and B if the recombination frequency is 0.09?

a) 900 cM

b) 90 cM

c) 9 cM

d) 0.9 cM

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