Principles of Inheritance and Variation Test

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Principles of Inheritance and Variation Test - 9

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Weekly Quiz Competition

Question 1
1 / -0

Chromosome theory of inheritance was proposed by

A
George Hammer

B
W.Sutton and T.Bover

C
Mendel

D
Watson and Crick

Solution

Walter Sutton and Theodor Boveri are credited with developing the Chromosomal Theory of Inheritance, which states that chromosomes carry the unit of heredity (genes) in 1902.
Question 2
1 / -0

In humans, height shows a lot of variation. It is an example of

A
Pleiotrophic inheritance

B
Multiple alleles

C
False allelic inheritance

D
Polygenic inheritance

Solution

Height of human being is not controlled by single pair of gene. A number of genes participate to form growth hormone that actually triggers the height of individual.
Question 3
1 / -0

Which among the following occurs in pair?

A
Only chromosome

B
Neither gene nor chromosome

C
Only gene

D
Both gene and chromosome

Solution

Both gene and chromosome occurs in pair and segregate during gamete formation by reduction division or meiosis.
Question 4
1 / -0

Chromosomal theory of inheritance was experimentally verified by T.H.Morgan and his colleagues working with tiny flies

A
Drosophila melanogaster

B
House fly

C
Spider

D
Mirabilis Jalapa

Solution

T.H.Morgan worked on the tiny fruit fly called Drosophila melanogaster. This tiny fly shows variation in eye colour and can be easily crossed with other to show the flow trait.
Question 5
1 / -0

Chromosome theory of XY sex determination was proposed by

A
Sutton and Boveri

B
Wilson and Stevens

C
Johannsen

D
Henking

Solution

Nettie Stevens and Edmund Beecher Wilson independently discovered the chromosomal XY sex-determination system (that males have XY and females have XX sex chromosomes).

Wilson made some of the discoveries in his partially correct 1900 paper, while Steven’s 1905 paper filled in the blanks and corrected some of Wilson’s errors.

Stevens and Wilson worked independently of each other in their discovery of the chromosomal basis of sexual differentiation.
Question 6
1 / -0

Crossing over occurs at

A
Four strand stage of panchytene

B
Two-strand stage during zygotne

C
Single-strand stage of chromosome during prophase

D
Metaphase-II of meiosis

Solution

Crossing over occurs at four strand stage of panchytene of meiosis-I. Each homologous chromosome has two stands. Exchange of gene occurs during this period.
Question 7
1 / -0

Inheritance of skin colour in humans is an example of

A
Co-dominance

B
Polygenic inheritance

C
Point Mutation

D
Chromosomal aberrations

Solution

Skin colour in human being is an example of polygenic inheritance. Eight different genes are involved in deciding the skin colour ranging between white to black.
Question 8
1 / -0

Crossing over brings

A
Reduction in number of chromosome

B
Segregation of genes

C
Recombination of genes

D
New trait into species

Solution

Crossing over brings recombination or new combination of genes and hence variations. It occurs during cell division in prophase stage of meiosis-I.
Question 9
1 / -0

The phenomenon of having more than two sets of chromosome is called

A
Autopolypoidy

B
Polyploidy

C
Allopolyploidy

D
Aneuploidy

Solution

Polyploidy is the phenomenon of having more than two genomes or sets of chromosomes in the nucleus of cell of an organism. It may be triploid, tetraploid etc. polyploidy with odd number of genomes are sexually sterile.
Question 10
1 / -0

A polygenic trait is controlled by 3 genes A, B and C. In a cross AaBbCc × AaBbCc, the phenotypic ratio of the offspring was observed as 1 : 6 : x : 20 : x : 6 : 1. What is the possible value of x?

A
15

B
12

C
9

D
25

Solution

Polygenic trait controlled by three genes will form 8 types of gametes. Combination of 8 types of gametes of male and female each result into 64 types of zygote in different ratio. So, possible value of x is 15 (1:6:15:20:15:6:1).

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Re-Attempt Weekly Quiz Competition

Principles of Inheritance and Variation Test - 9

Result

Principles of Inheritance and Variation Test - 9

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SHARING IS CARING

Question 1

George Hammer

W.Sutton and T.Bover

Mendel

Watson and Crick

Solution

Question 2

Pleiotrophic inheritance

Multiple alleles

False allelic inheritance

Polygenic inheritance

Solution

Question 3

Only chromosome

Neither gene nor chromosome

Only gene

Both gene and chromosome

Solution

Question 4

Drosophila melanogaster

House fly

Spider

Mirabilis Jalapa

Solution

Question 5

Sutton and Boveri

Wilson and Stevens

Johannsen

Henking

Solution

Question 6

Four strand stage of panchytene

Two-strand stage during zygotne

Single-strand stage of chromosome during prophase

Metaphase-II of meiosis

Solution

Question 7

Co-dominance

Polygenic inheritance

Point Mutation

Chromosomal aberrations

Solution

Question 8

Reduction in number of chromosome

Segregation of genes

Recombination of genes

New trait into species

Solution

Question 9

Autopolypoidy

Polyploidy

Allopolyploidy

Aneuploidy

Solution

Question 10

15

12

9

25

Solution

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