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Assignment
Class -12 Subject:Botany
Unit 2
Classical Gentics
Part – A
I.Choose the correct Answer
1.The genotype of a plant showing the dominant phenotype can be determined
a) Back cross
b)Test cross
c) Dihybrid cross
d)Pedigree cross
Answer:- b)Test cross
2.The complementary genes ratio is…..
a) 9:3:4
b) 12:3:1
c) 13:3
d) 9:7
Answer:- d) 9:7
3.In his classic experiments on pea plants, Mendel did not use
a) Flowering position
b)Seed colour
c) Pod length
d) Seed shape
Answer:- c) Pod length
4.If absence of starch resulting in wrinkled peas in which enzyme is catalyzes the formation of starch molecule.
a)Amylase
b)Invertase
c)Diastase
d)Starch branching enzyme
Answer:- d)Starch branching enzyme
5.An allele to kill an organism is called lethal gene, Who coined the term lethal?
(a) E.Baur
(b) Mendel
(C) Corren
(d) Hugo de vries
Answer:- (a) E.Baur
6.The phenomenon in which two alleles are both expressed in the heterozygous individual is known as
(a) Recessive
(b) Dominant
(c) Co-dominance
(d) Epistasis
Answer:- (c) Co-dominance
7.Pick out wrong one
a) Dominant allele- RR
(b)Recessive allele- rryy
c) Difference traits – RrYy
(d)Recessive traits- RRYY
Answer:- (b)Recessive allele- rryy
8.If heterozygous tall test cross gives
a) 100% tall
(b)100% dwarf
c) 50%tall & 50%dwarf
(d)75% tall
Answer:- c) 50%tall & 50%dwarf
9.Which one of the following characters is a homozygous character?
a)TT
b)Tt
c)Both a and b
d)None of the above
Answer:- a)TT
10.Mendel’s theory of inheritance known as Particulate theory
a) Waves theory
b) Movement theory
c) Novel theory
Answer:-
Part – B
II.Very Short Answer.
1.Define genetics.
The science of heredity (Inheritance) Genetics is the branch of biological science which deals with the mechanism of transmission of characters from parents to off springs. The term Genetics was introduced by W.Bateson in 1906.
2.What is Test cross.
Test cross is crossing an individual of unknown genotype with a homozygous recessive.
3.Write mendals law of independence assortment.
When two pairs of traits are combined in a hybrid, the segregation of one pair of characters is independent of the other pair of characters. Genes that are located in different chromosomes assort independently during meiosis
4.Define Incomplete dominance.
When one allele is not completely dominant to another allele it shows incomplete dominance.Such allelic interaction is known as incomplete dominance.F1 generation produces intermediate phenotype pink coloured flower
5.What are multiple alleles
Three or more alternative forms of a gene occupy the same locus and control the expression of a single trait. Eg. the ABO blood group
Part – C
III. Short Answer.
1.Explain the law of dominance in monohybrid cross.
The law of Dominance and the Law of Segregation give suitable explantion to mendel’s cross
2.Describe law of independent assortment.
3.Give the role of genes in pea plant purple flower.
4.What is meant by Cytoplasmic Inheritance.
5.Bring out the inheritance of chloroplast gene with an example.
Part – D
IV.Write in Details
1.Explain with an example how single genes affect multiple traits and alleles the
2. phenotype of an organism. Differentiate discontinuous and continuous variations.
