Tamil Nadu Board of Secondary EducationHSC Science Class 12th
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Tamil Nadu Board Samacheer Kalvi solutions for Class 12th Biology Botany answers guide chapter 3 - Chromosomal Basis of Inheritance [Latest edition]

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Class 12th Biology Botany answers guide - Shaalaa.com
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Chapter 3: Chromosomal Basis of Inheritance

Evaluation
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Evaluation [Pages 65 - 66]

Tamil Nadu Board Samacheer Kalvi solutions for Class 12th Biology Botany answers guide Chapter 3 Chromosomal Basis of InheritanceEvaluation [Pages 65 - 66]

Evaluation | Q 1 | Page 65

An allohexaploidy contains

  • Six different genomes

  • Six copies of three different genomes

  • Two copies of three different genomes

  • Six copies of one genome

Evaluation | Q 2 | Page 65

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

Evaluation | Q 3 | Page 66

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

Evaluation | Q 4 | Page 66

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 incomplete linkage
  3. The separation of two linked genes is possible in incomplete linkage
  4. Crossing over is absent in complete linkage
  • 1 and 2

  • 2 and 3

  • 3 and 4

  • 1 and 4

Evaluation | Q 5 | Page 66

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

Evaluation | Q 6 | Page 66

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

Evaluation | Q 7 | Page 66

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

Evaluation | Q 8 | Page 66

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

Evaluation | Q 9 | Page 66

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

Evaluation | Q 10 | Page 66

Changing the codon AGC to AGA represents

  • missense mutation

  • nonsense mutation

  • frameshift mutation

  • deletion mutation

Evaluation | Q 11 | Page 66

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

Evaluation | Q 12 | Page 66

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

Evaluation [Pages 66 - 67]

Tamil Nadu Board Samacheer Kalvi solutions for Class 12th Biology Botany answers guide Chapter 3 Chromosomal Basis of InheritanceEvaluation [Pages 66 - 67]

Evaluation | Q 13 | Page 66

When two different genes came from the same parent they tend to remain together.

What is the name of this phenomenon?

Evaluation | Q 13 | Page 66

When two different genes came from the same parent they tend to remain together.

Draw the cross with a suitable example.

Evaluation | Q 13 | Page 66

When two different genes came from the same parent they tend to remain together.

Write the observed phenotypic ratio.

Evaluation | Q 14 | Page 66

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?

Evaluation | Q 14 | Page 66

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.

Evaluation | Q 14 | Page 66

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?

Evaluation | Q 15 | Page 67
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
  1. What is the name of this test cross?
  2. How will you construct gene mapping from the above-given data?
  3. Find out the correct order of genes.
Evaluation | Q 16 | Page 67

What is the difference between missense and nonsense mutation?

Evaluation | Q 17 | Page 67

A B B C C D E F G H I

From the above figure identify the type of mutation and explain it.

Evaluation | Q 18 | Page 67

Write the salient features of the Sutton and Boveri concept.

Evaluation | Q 19 | Page 67

Explain the mechanism of crossing over.

Evaluation | Q 20 | Page 67

Write the steps involved in the molecular mechanism of DNA recombination with a diagram.

Evaluation | Q 21 | Page 67

How is Nicotiana exhibit self-incompatibility? Explain its mechanism.

Evaluation | Q 22 | Page 67

How sex is determined in monoecious plants. write their genes involved in it.

Evaluation | Q 23 | Page 67

What is gene mapping? Write its uses.

Evaluation | Q 24 | Page 67

Draw the diagram of different types of aneuploidy.

Evaluation | Q 25 | Page 67

Mention the name of man-made cereal. How it is formed?

Chapter 3: Chromosomal Basis of Inheritance

Evaluation
Class 12th Biology Botany answers guide - Shaalaa.com

Tamil Nadu Board Samacheer Kalvi solutions for Class 12th Biology Botany answers guide chapter 3 - Chromosomal Basis of Inheritance

Tamil Nadu Board Samacheer Kalvi solutions for Class 12th Biology Botany answers guide chapter 3 (Chromosomal Basis of Inheritance) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the Tamil Nadu Board of Secondary Education Class 12th Biology Botany answers guide solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in Class 12th Biology Botany answers guide chapter 3 Chromosomal Basis of Inheritance are Crossing Over, Concept of Mutation, Linkage, Chromosomal Theory of Inheritance, Multiple Alleles.

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