Ncert-Class 12- Biology- principle of inheritance and variation

Welcome to your Ncert-Class 12- Biology- principle of inheritance and variation

Instruction

Total Questions : 20

Total Marks : 20 x 4 = 80 Marks

Each Correct Question carries : 4 Marks

Each incorrect Question Carries : -1 Marks

Each Unattempted Question carry : 0 Marks

Be careful On Negative Markings

Blackening of exposed urine is a metabolic disorder due to

Homogentisic acid

Tyrosine

Phenylalanine

Valine replacing glutamic acid

None

Which of the following statement is not true?

None of these

Total number of chromosome is 46 46 is Down's syndrome

Mutation is change in genetic material

Chromosomal mutation can be easily studied by analysis of Karyotypes

None

The concept of an inborn error of metabolism was the first recognition of the relationship between gene activity and metabolic disease, made by

Archibold Garrod from general family inheritance patterns

Watson and Crick, as a natural outcome of their model of DNA

Pauling and Itano with sickle-cell anaemia

Beadle and Tatum with parasitic molds

None

In Drosophila gene for white eye colour is also responsible for depigmentation of body parts. It is an example of

Hypostatic gene

Pleiotropic gene

Epistatic gene

Oncogene

None

Choose the correct answer from the alternatives given.

Which characteristic of pea plants was not important in their selection as Mendels research organism?

many true-breeding varieties were available

most other scientists of the time were also using peas, so a lot was known about them

peas are easy to cultivate, and have a short generation time

pea plants are self-pollinating but can be cross-fertilized easily

None

Match column I with column II and select the correct option from the given codes.

Column I	Column II
A. Multiple alleles	(i) Phenylketonuria in Humans
B. Polygenes (Multiple genes)	(ii) Blood groups in humans
C. Pleiotropic	(iii) Skin color in humans

A-(i), B-(iii), C-(ii)

A-(iii), B-(ii), C-(i)

A-(ii), B-(iii), C-(i)

A-(ii), B-(i), C-(iii)

None

The inheritance pattern of a gene over generations among humans is studied by the pedigree analysis. Character studied in the pedigree analysis is equivalent to

Polygenic trait

Mendelian trait

Maternal trait

Quantitative trait

None

Which pair of features represents polygenic inheritance?

ABO blood groups, in humans and flower colour of Mirabilis jalapa

Human eye colour and sickle cell anaemia

Human height and skin colour

Hair pigment of mouse and tongue rolling in humans

None

Match the columns and choose the correct option

I	II
(a) Dominance	(i) Many genes govern a single character
(b) Codominance	(ii) In a heterozygous organism only one allele expresses itself
(c) Pleiotropy	(iii) In a heterozygous organism both alleles express themselves fully
(d) Polygenic inheritance	(iv) A single gene influences many characters

a-iv, b-iii, c-i, d-ii

a-iv, b-i, c-ii, d-iii.

a-ii, b-iii, c-iv, d-i

a-ii, b-i, c-iv, d-iii

None

10.

All are dominant traits studied by Mendel _________________.

Round seed, constricted pod, axial flower.

Green pod, inflated pod, axial flower

Yellow seed, violet flower, yellow pod

Axial flower, green pod, green seed

None

11.

What is the condition for priority of a node in a treap?

a node's priority should be greater than its parent

a node's priority is always given in decreasing order

the priority is randomly assigned and can have any value

a node's priority should be at least as large as its parent

None

12.

According to theory put forth to explain the mechanism of organic evolution, when structure of a gene under goes a change, the trait it represents also changes. This results in a heritable variation in population, and may lead to the formation of new species from pre existing species.

Change in gene structure is termed as

Variation

Gene knock out

Genetic drift

Mutation

None

13.

Given are some organisms.

(I) Fowl (II) Humans (III) Grasshopper

Following alphabets related to the given animals.

Male homogametic - A

Female heterogametic -B

Male heterogametic - C

Female homogametic - D

Which of the following options correctly describes the given animals in terms of sex determination?

(I) A, D (II) C, D (III) A, D

(I) C, D (II) A, B (III) C, D

(I) A, B (II) C, D (III) C, D

(I) B, C (II) C, D (III) A, B

None

14.

Recessive mutation are expressed normally

In heterozygous condition

Neither in homozygous nor in heterozygous condition

Has to express always since it is a mutation

In homozygous condition

None

15.

The color based constrasting traits in seven constrasting pairs,studied by Mental in pea plant were

None

16.

In garden pea, gene controlling starch synthesis related to all of the given phenomenon, except

Complete dominance

Codominance

Incomplete dominance

Pleiotropy

None

17.

After a mutation at a genetic locus, the character of an organism changes due to changes in

DNA replication

Protein structure

Protein synthesis

RNA transcription

None

18.

White eye mutation leads to depigmentation in many parts of the body in Drosophila. It is referred as

Polymorphic effect

Morphan syndrome

Pleiotropic effect

Multiple alleles

None

19.

Under which title was Mendel's work published in Natural History Society of Brunn?

Origin of species

Experiments on plants Hybridization

Experiment on Heredity and variation

Mendel's laws of inheritance

None

20.

Which of the following statements is correct regarding mutations?

Many mutations are recessive, and it is unlikely that both parents will have the same recessive mutation.

Mutations only occur in body cells and not in the gametes.

Mutations are not passed to offspring because they are lethal to the organisms.

Most mutations are fatal and not passed to offspring.

None

Time's up