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Published on: 28/09/2019
Botany - Classical Genetics
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.
What is intergenic gene interactions? Give example
2.
Give the proper terminologies for the following statement
(a) Single gene affecting multiple traits
(b) Single trait affected by many genes.
3.
Define lethal alleles.
4.
Write the phenotypic ratio of the trihybrid cross.
5.
How many types of gametes are produced by a dihybrid plant? If the same plant is self-fertilized, how many second-generation offsprings are developed?
6.
Define test cross.
7.
Write the phenotypic and genotypic ratio of monohybrid cross.
8.
Define the terms
(i) Emasculation
(ii) Alleles
9.
Name any four characters of pisum sativum that was studied by Mendel.
10.
Which organism was studied by Gregor Mendel? How many traits does he considered on his experiments
11.
Define Genetics.
12.
13.
Give the names of the scientists who rediscovered Mendelism
14.
What is meant by true breeding or pure breeding lines / strain?
15.
Name the seven contrasting traits of Mendel.
1.
Interlocus interactions take place between the alleles at different loci i.e. between alleles of different genes. Eg: Dominant Epistasis
2.
(a) Pleiotropism
(b) Poly genic inheritance
3.
An allele which has the potential to cause the death of an organism is called a Lethal Allele.
4.
27:9:9:9:3:3:3:1
5.
Four different gametes are produced by a dihybrid plant and on selfing, it yield 16 offsprings.
6.
It is crossing an individual of unknown genotype with a homozygous recessive. (Tt \(\times\) tt) or YyRr \(\times\) YYrr.
7.
(a) Phenotypic ratio = 3 : 1
(b) Genotypic ratio = 1 : 2 : 1
8.
Emasculation: Removal of anthers from the flower
Alleles: Alternate forms of a gene
9.
Seed shape, flower color, flower position & pod color.
10.
Gregor Mendel selected seven pairs of characters in Pisum sativum (garden pea)
11.
"Genetics" is the branch of biological science which deals with the mechanism of transmission of characters from parents to off springs.
12.
13.
(i) Hugo de Vries of Holland
(ii) Carl Correns of Germany
(iii) Erich von Tschermak of Austria
14.
A true breeding lines means it has undergone continuous self pollination having stable trait inheritance from parent to off spring.
15.
Seven characters of pisum satiyum studied by Mendel.
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Accountancy
History
Computer Applications
Biology
Computer Technology
Computer Applications
Computer Science
Business Maths and Statistics
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Maths
Chemistry
Physics
Computer Technology
History
Accountancy
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