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Published on: 29/08/2022
QB365 provides a detailed and simple solution for every Possible Book Back Questions in Class 12 Biology Subject - Botany - Chromosomal Basis of Inheritance, English Medium. It will help Students to get more practice questions, Students can Practice these question papers in addition to score best marks.
Download Tamil Nadu 12th Standard Biology question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Biology Test1.
How many map units separate two alleles A and B if the recombination frequency is 0.09?
900 cM
90 cM
9 cM
0.9 cM
2.
3.
Changing the codon AGC to AGA represents _______.
missense mutation
nonsense mutation
frameshift mutation
deletion mutation
4.
If haploid number in a cell is 18. The double monosomic and trisomic number will be _____.
35 and 37
34 and 37
37 and 35
17 and 19
5.
The point mutation sequence for transition, transition, transversion and transversion in DNA are ______.
A to T, T to A, C to G and G to C
A to G, C to T, C to G and T to A
C to G, A to G, T to A and G to A
G to C, A to T, T to A and C to G
6.
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 _____.
GHSL
SHGL
SGHL
HSLG
7.
Due to incomplete linkage in maize, the ratio of parental and recombinants are ______.
50:50
7:1:1:7
96.4: 3.6
1:7:7:1
8.
Accurate mapping of genes can be done by three point test cross because increases _____.
Possibility of single cross over
Possibility of double cross over
Possibility of multiple cross over
Possibility of recombination frequency
9.
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
1 and 2
2 and 3
3 and 4
1 and 4
10.
11.
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?
25 AB, 25 ab, 25 Ab, 25 aB
10 AB, 10 ab
45 AB, 45 ab
45 AB, 45 ab, 5 Ab, 5aB
12.
An allohexaploidy contains ______.
Six different genomes
Six copies of three different genomes
Two copies of three different genomes
Six copies of one genome
1.
(c)
9 cM
2.
(c)
3.
(a)
missense mutation
4.
(b)
34 and 37
5.
(b)
A to G, C to T, C to G and T to A
6.
(b)
SHGL
7.
(b)
7:1:1:7
8.
(d)
Possibility of recombination frequency
9.
(c)
3 and 4
10.
(c)
11.
(d)
45 AB, 45 ab, 5 Ab, 5aB
12.
(c)
Two copies of three different genomes
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