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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 Botany [English] Class 12 TN Board chapter 3 - Chromosomal Basis of Inheritance - Shaalaa.com](/images/botany-english-class-12-tn-board_6:5f2b1b2038084cf381bfa42c826a928c.jpg "Samacheer Kalvi solutions for 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 Botany [English] Class 12 TN Board.
Samacheer Kalvi solutions for Botany [English] Class 12 TN Board 3 Chromosomal Basis of Inheritance Evaluation [Pages 87 - 90]
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
Which one of the following pairs of codons are correctly matched with their function or the signal for the particular amino acid?
UUA, UCA - Leucine
GUU, GCU - Alanine
UAG, UGA - Stop
AUG, ACG – Start / Methionine
Removal of introns and joining of exons in a defined order during transcription is called
Splicing
Looping
Looping
Slicing
If one strand of DNA has the nitrogenous base sequence as ATCTS, what would be the complementary RNA strand sequence?
ATCGU
TTAGU
UAGAC
AACTG
Removal of RNA polymerase III nucleoplasm will affect the synthesis of
rRNA
tRNA
hnRNA
mRNA
DNA dependent RNA polymerase catalyzes transcription on one strand of the DNA which is called the
Alpha strand
Anti strand
Template strand
Coding strand
Which of the following correctly represents the flow of genetic information?
DNA → RNA → Protein
RNA → DNA → Protein
RNA → Protein → DNA
Protein → RNA → DNA
Initiation codon is
UUU
UGA
AUG
UAG
A eukaryotic gene contains two kinds of base sequences which of these plays an important role in protein synthesis?
Introns
Exons
Both a and b
None of the above
Codon – anticodon interactions occur by
Covalent bond
Electrostatic interactions
Hydrogen bonds
Hydrophobic interaction
Which of the following RNA polymerases is responsible for the transcription of protein-coding genes in eukaryotes?
RNA Pol I
RNA Poly II
RNA Pol III
RNA Pol III
How are RNA molecules transported out of the nucleus
Passive diffusion through the membrane
Through membrane pores in an energy independent process
Through membrane pores in an energy-dependent process
Through a channel in the membrane that leads to the endoplastic reticulation
During translation, the codon in mRNA is actually “read” by
The A site in the ribosomes
The A site in the ribosomes
The anticodon in at RNA
The anticodon is an amino acid
A complex of ribosome attached to a single strand of RNA is known as
Polysome
Polymer
Polypeptide
Okazaki fragment
Which of the following is the start codon
AUG
UGA
UAA
UAG
What is true about tRNA?
It binds with an amino acid at its 3’ end
It has 5 double-stranded regions
It has a codon at one end which recognizes the anticodon of mRNA
It looks like clover leaf in the three D structure
Which one of the following hydrolysis internal phosphodiester bonds in a polynucleotide chain?
Lipase
Exonuclease
Endonuclease
Protease
DNA element with ability to change position is called
Cistron
Transposon
Intron
Recon
Spliceosomes are not found in cells of
Plants
Fungi
Animals
Bacteria
During DNA replication Okazaki fragments are used to elongate
The leading strand towards replication fork
The lagging strand towards replication fork
The leading strand away from replication fork
The lagging strand away from replication fork
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?
What is DNA repair?
Solutions for 3: Chromosomal Basis of Inheritance
Samacheer Kalvi solutions for Botany [English] Class 12 TN Board chapter 3 - Chromosomal Basis of Inheritance
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Concepts covered in Botany [English] Class 12 TN Board chapter 3 Chromosomal Basis of Inheritance are DNA Metabolism in Plants, Linkage, Crossing Over, Sex Determination in Plants, Mutations.
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