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

St. Britto Hr. Sec. School - Madurai

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

Time : 1.30 Hours

Part - A

Multiple Choice Question - Answer All Question

The number of linkage groups in maize is __________

15
20
25
10

Crossing over occurs during _________ stage of meiosis.

pachytene
tetrad
metaphase-I
metaphase-II

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

The A and B genes are 10 cM apart on a chromosome. If an AB/ab heterozygote is testcrossed 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

An allohexaploidy contains

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

One map unit in a genetic map is called __________

centimorgan
centi meter
millimeter
meter

Changing the codon AGC to AGA represents

mis-sense mutation
non-sense mutation
frameshift mutation
deletion mutation

Genes G S L H are located on 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

A plant in which environment plays a role in sexual determination is

pea
maize
equisetum
sphaerocarpos

__________ is required for transcription

TATA box
DNA Polymerase
Okazaki fragments
All the above

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

The number of chromosomes is a diploid cell of Drosophila is ___________

6
8
10
12

Jumping genes was reported in ___________

Neurospora
Drosophila
Polymerase
Maize

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

Part - B

Generic 5 - Answer All Question

Write a note on point mutation.

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?

What is gene mapping? Write its uses

Draw the diagram of different types of aneuploidy.

SNo. Gamete types Number ofro 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.

Write a note on polyploidy.
Write the salient features of Sutton and Boveri concept.

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

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