Principles of Inheritance and Variation Test

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Principles of Inheritance and Variation Test - 6

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Question 1
1 / -0

Autopolyploidy is the presence of more than two sets of same chromosome or more than two genomes. Which of the following is not a characteristic feature of autopolyploid plants?

A
These plants are larger in size than their diploid counterparts.

B
Their leaves, flowers, fruits and seeds are larger in size.

C
Their flowering is instantaneous.

D
Number of seeds per plant are less.

Solution

This is the correct option as it is not a characteristic of autopolyploid plants. Their flowering is delayed.
Question 2
1 / -0

In which of the following types of gene interaction, one character is controlled by two pairs of non-allelic independent genes?

A
Epistatic gene action

B
Inhibitory genes

C
Duplicate genes

D
Complementary genes

Solution

In complementary genes, one character is controlled by two pairs of non-allelic independent genes.
Question 3
1 / -0

Sometimes, one gene has multiple phenotypic effects. This type of gene is called as

A
collaborator gene

B
polymeric gene

C
pleiotropic gene

D
duplicate gene

Solution

The gene having multiple phenotypic effects is called pleiotropic gene. E.g. The same gene affects the shape of RBCs and structure of haemoglobin in human beings suffering from sickle-cell disease.
Question 4
1 / -0

Directions For Questions

In the following question, two statements are given. One is assertion and the other is reason. Examine the statements carefully and mark the correct answer according to the instructions given below.

...view full instructions

Assertion: When one gene in its homozygous or heterozygous dominant state masks the expression of the other gene, it is called dominant epistasis.
Reason: The modified F₂ phenotypic ratio of dominant epistasis is 12 : 3 : 4.

A
Both Assertion and Reason are true and Reason is the correct explanation of the Assertion.

B
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

C
Assertion is true but Reason is false.

D
Both Assertion and Reason are false.

Solution

This is the correct option as assertion is true but the reason is false. The modified F₂ phenotypic ratio of dominant epistasis is 12 : 3 : 1.
Question 5
1 / -0

Sickle cell anaemia is an autosomal genetic disorder and is common in tropical Africa. It is caused by the substitution of

A
valine by glutamic acid at sixth position of alpha chain of haemoglobin.

B
valine by glutamic acid at sixth position of beta chain of haemoglobin.

C
glutamic acid by valine at sixth position of alpha chain of haemoglobin

D
glutamic acid by valine at sixth position of beta chain of haemoglobin

Solution

Sickle cell anaemia is caused by the substitution of glutamic acid by valine at sixth position of beta chain of haemoglobin.

Question 6

1 / -0

Match column I with column II.

Column I	Column II
a. F plasmids	1. They have genes that code for colicins, the proteins that kill sensitive E.coli.
b. R plasmids	2. They carry genes for resistance to antibodies.
c. Col plasmids	3. They carry the fertility factor that is responsible for bacterial conjugation.

a - 3, b - 2, c - 1

a - 3, b - 1, c - 2

a - 2, b - 3, c - 1

a - 1, b - 2, c - 3

Solution

F plasmids carry the fertility factor that is responsible for bacterial conjugation. R plasmids carry genes for resistance to antibodies. Col plasmids have genes that code for colicins, the proteins that kill sensitive E.coli.

Question 7
1 / -0

There are four types of viruses on the basis of their genetic material. Which of the following viruses has double stranded DNA?

A
Caliphage

B
Myxo virus

C
Reo-virus

D
Adenovirus

Solution

Adenovirus genomes are linear, non-segmented double-stranded (ds) DNA molecules that are typically 26-46 Kbp long, containing 23-46 protein-coding genes.
Question 8
1 / -0

Which of the following chromosomes has two equal arms and assumes 'V' shape in anaphase stage of cell division?

A
Sub-metacentric

B
Metacentric

C
Acrocentric

D
Telocentric

Solution

Metacentric chromosome has two equal arms and assumes 'V' shape in anaphase stage of cell division.
Question 9
1 / -0

In which of the following types of sex chromosomes, female sex is heterogametic and two types of eggs are laid by the females?

A
ZW-ZZ

B
ZO-ZZ

C
XX-XO

D
XX-XY

Solution

In ZW-ZZ type of sex chromosomes, female sex is heterogametic and two types of eggs are laid by the females. The males are homogametic.

Question 10

1 / -0

Match the following:

a. Substitution mutations	1. These are artificial mutations induced with the help of certain agents called mutagens.
b. Spontaneous mutations	2. These are replacements of one nitrogenous base of DNA by another nitrogenous base or its derivatives.
c. Induced mutations	3. These occur suddenly at random in nature but in low frequencies.

a - 2, b - 1, c - 3

a - 3, b - 2, c - 1

a - 2, b - 3, c - 1

a - 1, b - 3, c - 2

Solution

Substitution mutations are replacements of one nitrogenous base of DNA by another nitrogenous base or its derivatives. Spontaneous mutations occur suddenly at random in nature but in low frequencies. Induced mutations are artificial mutations induced with the help of certain agents called mutagens.

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Principles of Inheritance and Variation Test - 6

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Principles of Inheritance and Variation Test - 6

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Question 1

These plants are larger in size than their diploid counterparts.

Their leaves, flowers, fruits and seeds are larger in size.

Their flowering is instantaneous.

Number of seeds per plant are less.

Solution

Question 2

Epistatic gene action

Inhibitory genes

Duplicate genes

Complementary genes

Solution

Question 3

collaborator gene

polymeric gene

pleiotropic gene

duplicate gene

Solution

Question 4

Both Assertion and Reason are true and Reason is the correct explanation of the Assertion.

Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

Assertion is true but Reason is false.

Both Assertion and Reason are false.

Solution

Question 5

valine by glutamic acid at sixth position of alpha chain of haemoglobin.

valine by glutamic acid at sixth position of beta chain of haemoglobin.

glutamic acid by valine at sixth position of alpha chain of haemoglobin

glutamic acid by valine at sixth position of beta chain of haemoglobin

Solution

Question 6

a - 3, b - 2, c - 1

a - 3, b - 1, c - 2

a - 2, b - 3, c - 1

a - 1, b - 2, c - 3

Solution

Question 7

Caliphage

Myxo virus

Reo-virus

Adenovirus

Solution

Question 8

Sub-metacentric

Metacentric

Acrocentric

Telocentric

Solution

Question 9

ZW-ZZ

ZO-ZZ

XX-XO

XX-XY

Solution

Question 10

a - 2, b - 1, c - 3

a - 3, b - 2, c - 1

a - 2, b - 3, c - 1

a - 1, b - 3, c - 2

Solution

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