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12th Biology Monthly Test - 2 ( Botany - Chromosomal Basis of Inheritance )

St. Britto Hr. Sec. School - Madurai

12th Biology Monthly Test - 2 ( Botany - Chromosomal Basis of Inheritance )-Aug 2020

Time : 2.30 Hours

Part - A

Multiple Choice Question - Answer All Question

Cynodon Dactylon ( doob grass) is a natural __________

Allopolyploid
Autotetraploid
Autotriploid
Hexaploid

The enzyme ___________ breaks the covalent bonds in DNA and removes positive supercoiling during replication.

Ligase
Topoisomerase
Polymerase
Resriction endonuclease

___________ discovered that crossing over is completely absent in some species of male drosophila.

Morgan
Bridges
Bateson
Reginald

AUG codon is for the amino acid _____________

Cysteine
Methionine
Valine
Leucine

If 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

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

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

Changing the codon AGC to AGA represents

missense mutation
nonsense mutation
frameshift mutation
deletion mutation

The number of linkage groups in maize is __________

15
20
25
10

The number of chromosomes in a diploid cell of papaya is

26
36
40
38

Jumping genes was reported in ___________

Neurospora
Drosophila
Polymerase
Maize

___________ was the first to suggest occurrence of distinct pairs of chromosomes.

Sutton
Boveri
Montgomery
Morgan

___________ is not a mutation involving nucleotide substitution.

Insertion
Missense
Transition
Deletion

A mutation which reduces normal function is called __________ mutation

null
ectopic
Hypermorphic
Hypomorphic

One map unit in a genetic map is called __________

centimorgan
centi meter
millimeter
meter

Part - B

Generic 2 - Answer All Question

What are linkage groups?

What are comutagens? Give an example.
What is the difference between missense and nonsense mutation?

Define crossing over.

What is polyploidy?

Name the stop codons?

What is nullisomy?

How are mutations classified?

Part - C

Generic 3 - Answer All Question

What is genetic mapping?

What are the uses of genetic mapping?
What is significance of cross over?

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

What is the significance of ploidy?

Explain coupling and repulsion theory.

List the difference between linkage and crossing over.

What is a map unit?

Part - D

Generic 5 - Answer All Question

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

Write a note on polyploidy.

Explain the mechanism of crossing over.

If you cross dominant genotype PV/PV male Drosophila with double recessive female and obtain F₁hybrid. Now you cross F1 male with double recessive female.

i) What type of linkage is seen?
ii) Draw the crpss with correct genotype.
iii) What is the possible genotype in F₂
generation?

Draw the diagram of different types of aneuploidy.
Write the steps involved in molecular mechanism of DNA recombination with diagram.

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