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12th Biology Weekly Test - 1 (Botany - Chromosomal Basis of Inheritance)

St. Britto Hr. Sec. School - Madurai

12th Biology Weekly Test - 1 (Botany - Chromosomal Basis of Inheritance)-Aug 2020

Time : 1.30 Hours

Part - A

Multiple Choice Question - Answer All Question

The number of chromosomes in diploid cell of ophioglossum is _________

8
34
1262
48

Sharbati Sonora is a mutant wheat variety got by using ____________

Nitrous acid
X-ray
gamma ray
MMS

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

Morgan
Bridges
Bateson
Reginald

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

___________ is not a mutation involving nucleotide substitution.

Insertion
Missense
Transition
Deletion

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

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

Genes G S L H are located on same chromosome. The recombination percentage is between Land G is 15%, Sand Lis 50%, H
and S are 20%. The correct order of genes is

GHSL
SHGL
SGHL
HSLG

Cynodon Dactylon ( doob grass) is a natural __________

Allopolyploid
Autotetraploid
Autotriploid
Hexaploid

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

Part - B

Generic 2 - Answer All Question

Write a note on mutant variety of castor.

What is a codon?
What is polyploidy?

Define mutation.

When two different genes came from same parent they tend to remain together.
i) What is the name of this phenomenon?
ii) Draw the cross with suitable example.
iii) Write the observed phenotypic ratio.

What is alternative splicing?

Part - C

Generic 3 - Answer All Question

List the difference between linkage and crossing over.

Tabulate the type of mutations based on molecular changes?

What is the significance of ploidy?
What is synapsis or syndesis?

What are multiple alleles?

Draw the diagram of different types of aneuploidy.

Part - D

Generic 5 - Answer All Question

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

How sex is determined in monoecious plants. write their genes involved in it.
Write the salient features of Sutton and Boveri concept.

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

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