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

St. Britto Hr. Sec. School - Madurai

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

Time : 2.30 Hours

Part - A

Multiple Choice Question - Answer All Question

An allohexaploidy contains

Six different genomes
Six copies of three different genomes
Two copies of three different genomes
Six copies of one genome

Self sterility caused by multiple alleles has been reported in ___________

pea
drosophila
maize
nicotiana

The number of chromosomes in a diploid cell of papaya is

26
36
40
38

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

The point mutation sequence for transition, transition, transversion and transversion in DNA are

A toT,T to A, C toG and G to C
A to G, C to T, C to G and T to A
C toG, A toG, T to A and G to A
G to C, A toT, T to A and C toG

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

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

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

Sutton
Boveri
Montgomery
Morgan

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

An allohexaploidy contains

Six different genomes
Six copies of three different genomes
Two copies of three different genomes
Six copies of one genome

Chemical mutagenesis was first reported by

H. J. Muller
C. Auerbach
Stadler
Morgan

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

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

Assertion (A) : Gamma rays are generally use 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 Rare wrong

The number of linkage groups in maize is __________

15
20
25
10

Part - B

Generic 2 - Answer All Question

Give examples of four chemical mutagens.
What is chiasmata?

What is synaptonemal complex?

What is transcription?

What are linkage groups?

Name the stop codons?

Define crossing over.

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

i) What is the name of this test cross?
ii) How will you construct gene mapping from the above given data?
iii) Find out the correct order of genes.

What is a codon?

What are anticodons?

What is Sharbati Sonora?

What is Synteny?

What is hnRNA?

What is monocistronic mRNA?

What are Okazaki fragments?

What is polyploidy?

Part - C

Generic 3 - Answer All Question

Differentiate Translocation and Crossing over.

Differentiate Exons and Introns

Tabulate the type of mutations based on molecular changes?
Explain coupling and repulsion theory.

What is recombination?

What is genetic mapping?

What is gene mapping? Write its uses.

Define plant genome.

What are the significances of transposons?

What is synapsis or syndesis?

What are multiple alleles?

Part - D

Generic 5 - Answer All Question

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

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

How sex is determined in monoecious plants. write their genes involved in it.
Explain the mechanism of crossing over.

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

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 suitabl~ example.
iii) Write the observed phenotypic ratio.

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