Botany XII - Principles of Inheritance and Variation 01

Question : 1

Consider the following three statements (a–c) and select the option which includes all the correct ones only
(a) Heredity deals with the phenomenon of “like begets like”
(b) Genetics deals with inheritance as well as the variation
(c) Humans knew from as early as 800–1000 B.C. that one of the causes of variation was hidden in sexual reproduction
 

Options:

	b & c
	a & b
	All a, b & c
	a & c

Solution :

(B)

8000–10000 B.C.

You scored 0 of 1

Question : 2

(skipped)

Which of the following allele influences the appearance of the phenotype only in the presence of another identical allele?
 

Options:

	Dominant allele
	Co-dominant allele
	Recessive allele
	Wild allele

Solution :

(C)

Dominant allele influences the appearance
of the phenotype even in the
presence of an alternative allele.

You scored 0 of 1

Question : 3

(skipped)

Which of the following variations are responsible for formation of new species?
 

Options:

	Somatogenic variations
	Mutations
	Discontinuous variations
	More than one option is correct

Solution :

(D)

Both (2) & (3)

You scored 0 of 1

Question : 4

(skipped)

Polydactyly in humans is an example of
 

Options:

	Meristic discontinuous variation
	Substantive continuous variation
	Meristic continuous variation
	Substantive discontinuous variation

Solution :

(A)

Meristic variation – Change in number of
parts

You scored 0 of 1

Question : 5

(skipped)

Which of the following statement for a trait is correct?
 

Options:

	Includes two contrasting non-inheritable characters
	An inherited character and its detectable variant
	Representation of an individual’s genetic constitution
	Feature of garden pea only

Solution :

(B)

Each character has two traits.

You scored 0 of 1

Question : 6

(skipped)

Study of various aspects of chromosomes is called as
 

Options:

	Biochemical genetics
	Forward genetics
	Cytogenetics
	Reverse genetics

Solution :

(C)

Biochemical genetics/ molecular
genetics.

You scored 0 of 1

Question : 7

(skipped)

Mark the incorrect match.
 

Options:

	Saltations                  –           Discontinuous variation
	Variation                      –           Degree by which progeny differs from their parents
	Forward genetics       –           Study of genes whose protein products are unknown
	Inheritance                 –           Process by which characters are passed on from parent to progeny

Solution :

(C)

Option (3) for reverse genetics

You scored 0 of 1

Question : 8

(skipped)

Variation in number of grains in an ear of wheat is due to
 

Options:

	Point mutation
	Genomatic mutation
	Asexual reproduction
	Recombination

Solution :

(D)

It is an example of continuous variation

You scored 0 of 1

Question : 9

(skipped)

Which of the following variations are acquired and noninheritable in nature?
 

Options:

	Somatogenic
	Blastogenic
	Meristic
	Substantive

Solution :

(A)

Blastogenic inheritance may be meristic
or substantive type.

You scored 0 of 1

Question : 10

(skipped)

Mark the incorrect match.
 

Options:

	Behavioural genetics           –      Study of interaction of genes with the environment to produce a particular                                                      pattern of behaviour
	Blastogenic variation           –      Inheritable in nature
	Molecular genetics               –     Study of structure and function of genes
	Meristic variation                  –     Influence shape, colour and size

Solution :

(D)

Substantive – Influence shape, colour
and size.