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Chapters
2: Classical Genetics
▶ 3: Chromosomal Basis of Inheritance
4: Principles and Processes of Biotechnology
5: Plant Tissue Culture
6: Principles of Ecology
7: Ecosystem
8: Environmental Issues
9: Plant Breeding
10: Economically Useful Plants and Entrepreneurial Botany
![Samacheer Kalvi solutions for Biology (Botany) [English] Class 12 TN Board chapter 3 - Chromosomal Basis of Inheritance - Shaalaa.com](/images/biology-botany-english-class-12-tn-board_6:5f2b1b2038084cf381bfa42c826a928c.jpg "Samacheer Kalvi solutions for Biology (Botany) [English] Class 12 TN Board chapter 3 - Chromosomal Basis of Inheritance")
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Solutions for Chapter 3: Chromosomal Basis of Inheritance
Below listed, you can find solutions for Chapter 3 of Tamil Nadu Board of Secondary Education Samacheer Kalvi for Biology (Botany) [English] Class 12 TN Board.
Samacheer Kalvi solutions for Biology (Botany) [English] Class 12 TN Board 3 Chromosomal Basis of Inheritance Evaluation [Pages 65 - 67]
An allohexaploidy contains
Six different genomes
Six copies of three different genomes
Two copies of three different genomes
Six copies of one genome
The A and B genes are 10 cm apart on a chromosome. If an AB/ab heterozygote is test crossed 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
Match List I with List II.
| List I | List II | ||
| A. | A pair of chromosomes extra with diploid | i) | monosomy |
| B. | One chromosome extra to the diploid | ii) | tetrasomy |
| C. | One chromosome loses from diploid | iii) | trisomy |
| D. | Two individual chromosomes lose from diploid | iv) | double monosomy |
A - i, B - iii, C - ii, D - iv
A - ii, B - iii, C - iv, D - i
A - ii, B - iii, C - i, D - iv
A - iii, B - ii, C - i, D - iv
Which of the following sentences are correct?
- The offspring exhibit only parental combinations due to incomplete linkage
- The linked genes exhibit some crossing over incomplete linkage
- The separation of two linked genes is possible in incomplete linkage
- Crossing over is absent in complete linkage
1 and 2
2 and 3
3 and 4
1 and 4
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
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
Genes G S L H are located on the 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
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
If the haploid number in a cell is 18. The double monosomic and trisomic number will be
35 and 37
34 and 35
37 and 35
17 and 19
Changing the codon AGC to AGA represents
missense mutation
nonsense mutation
frameshift mutation
deletion mutation
Assertion (A): Gamma rays are generally used to induce mutation in wheat varieties.
Reason (R): Because they carry lower energy to non-ionize electrons from atom
A is correct. R is correct explanation of A
A is correct. R is not correct explanation of A
A is correct. R is wrong explanation of A
A and R is wrong
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
When two different genes came from the same parent they tend to remain together.
What is the name of this phenomenon?
When two different genes came from the same parent they tend to remain together.
Draw the cross with a suitable example.
When two different genes came from the same parent they tend to remain together.
Write the observed phenotypic ratio.
If you cross dominant genotype PV/PV male Drosophila with double recessive female and obtain F1 hybrid. Now you cross F1 male with double recessive female.
What type of linkage is seen?
If you cross dominant genotype PV/PV male Drosophila with double recessive female and obtain F1 hybrid. Now you cross F1 male with double recessive female.
Draw the cross with the correct genotype.
If you cross dominant genotype PV/PV male Drosophila with double recessive female and obtain F1 hybrid. Now you cross F1 male with double recessive female.
What is the possible genotype in the F2 generation?
| S. no | Gamete types | Number of progenies |
| 1. | ABC | 349 |
| 2. | Abc | 114 |
| 3. | abC | 124 |
| 4. | AbC | 5 |
| 5. | aBc | 4 |
| 6. | aBC | 116 |
| 7. | ABc | 128 |
| 8. | abc | 360 |
- What is the name of this test cross?
- How will you construct gene mapping from the above-given data?
- Find out the correct order of genes.
What is the difference between missense and nonsense mutation?
A B B C C D E F G H I
From the above figure identify the type of mutation and explain it.
Write the salient features of the Sutton and Boveri concept.
Explain the mechanism of crossing over.
Write the steps involved in the molecular mechanism of DNA recombination with a diagram.
How is Nicotiana exhibit self-incompatibility? Explain its mechanism.
How sex is determined in monoecious plants. write their genes involved in it.
What is gene mapping? Write its uses.
Draw the diagram of different types of aneuploidy.
Mention the name of man-made cereal. How it is formed?
Solutions for 3: Chromosomal Basis of Inheritance
Samacheer Kalvi solutions for Biology (Botany) [English] Class 12 TN Board chapter 3 - Chromosomal Basis of Inheritance
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Concepts covered in Biology (Botany) [English] Class 12 TN Board chapter 3 Chromosomal Basis of Inheritance are Crossing Over, Concept of Mutation, Linkage, Chromosomal Theory of Inheritance, Multiple Alleles.
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