12th Standard Syllabus & Materials
12th Standard
TN 12th English Poem - 6 - Incident of the French Camp Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th English Prose - 6 - On the Rule of the Road Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th English Prose - 5 - The Chair Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th English Supplementary - 4 - The Midnight Visitor Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th English Poem - 4 - Ulysses Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th English Prose - 4 - The Summit Sample Question Papers Study Material - QB365 Set A
Published on: 05/11/2020
12th Standard Zoology - Principles of Inheritance and Variation English Medium Free Online Test One Mark Questions 2020 - 2021
Download Tamil Nadu 12th Standard Biology question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Biology Test1.
Depending on position of centromere and relative length of two arms human chromosomes can be classified into ________ type.
2
3
4
5
2.
The ZW - ZZ type of sex determination is seen ________.
Butterflies
Drosophila
Gypsy moth
Human being
3.
The__________ is called null allele.
IA
IOIB
IO
IBIB
4.
ZW-ZZ system of sex determination occurs in _____.
Fishes
Reptiles
Birds
All of these
5.
Improvement of human race by encouraging the healthy persons to marry early and produce large number of children is called
Positive eugenics
Negative eugenics
Positive euthenics
Positive euphenics
6.
Pataus syndrome is also referred to as ______.
13-Trisomy
18-Trisormy
21-Trisormy
None of these
7.
A marriage between a colourblind man and a normal woman produces _______.
All carrier daughters and normal sons
50% carrier daughters, 50% normal daughters
50% colourblind sons, 50% normal sons
All carrier offsprings
8.
If the childs blood group is ‘O’ and fathers blood group is ‘A’ and mother’s blood group is ‘B’ the genotype of the parents will be ______.
IA IA and IB Io
IA Io and IB Io
IA Io and IoIo
IoIo and IB IB
9.
Three children of a family have blood groups A, AB and B. What could be the genotypes of their parents?
IA IB and IoIo
IA Io and IBIo
IB IB and IA IA
IA IA and IoIo
10.
Haemophilia is more common in males because it is a ______.
Recessive character carried by Y-chromosome
Dominant character carried by Y-chromosome
Dominant trait carried by X-chromosome
Recessive trait carried by X-chromosome
1.
(c)
4
2.
(c)
Gypsy moth
3.
(c)
IO
4.
(d)
All of these
5.
(a)
Positive eugenics
6.
(a)
13-Trisomy
7.
(a)
All carrier daughters and normal sons
8.
(b)
IA Io and IB Io
9.
(b)
IA Io and IBIo
10.
(d)
Recessive trait carried by X-chromosome
12th Standard Syllabus & Materials
12th Standard
TN 12th English Supplementary - 3 - The Hour of Truth (Play) Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th English Poem - 3 - All the World’s a Stage Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th English Prose - 3 - In Celebration of Being Alive Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th English Supplementary - 2 - Life of Pi Sample Question Papers Study Material - QB365 Set A
Tamilnadu Stateboard 12th Standard Subjects
Maths
Chemistry
Physics
Biology
Computer Science
Business Maths and Statistics
Economics
Commerce
Accountancy
History
Computer Applications
Biology
Computer Technology
Computer Applications
Computer Science
Business Maths and Statistics
Commerce
Economics
Maths
Chemistry
Physics
Computer Technology
History
Accountancy
Tamil
English
French
Tamilnadu Stateboard Standards
