Principles of Inheritance and Variation Test

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Principles of Inheritance and Variation Test - 28

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Weekly Quiz Competition

Question 1
1 / -0

The scientist who removed the tail of mouse repeatedly for many generations and ultimately reporting that any change in the somatic regions of the body is not inherited in the next generation is

A
Darwin

B
Bateson

C
Lamarck

D
Weismann

Solution

Friedrich Leopold August Weismann was a German evolutionary biologist. His main contribution was the germ plasm theory according to which (in a multicellular organism) inheritance only takes place by means of the germ cellsthe gametes such as egg cells and sperm cells. Other cells of the bodysomatic cellsdo not function as agents of heredity. Genetic information cannot pass from soma to germ plasm and on to the next generation. This is referred to as the Weismann barrier.
Question 2
1 / -0

The cross used to ascertain whether the plant is homozygous or heterozygous is

A
Hybrid cross

B
Reciprocal cross

C
Test cross

D
Monohybrid cross

Solution

This cross involves a cross between an organism with an unknown genotype and an organism that is homozygous recessive for that trait. Test cross helps to determine whether the individual being tested is homozygous dominant (purebred) or heterozygous dominant (hybrid).
Question 3
1 / -0

In pedigree analysis, circles represent

A
Normal males

B
Normal females

C
Affected males

D
Affected females

Solution

In pedigree analysis, normal male and normal females are represented by "square" and "circle" respectively. The affected male and affected females are represented by "shaded square" and "shaded circle" respectively. Hence, correct answer is option B.
Question 4
1 / -0

Test cross is used to

A
Check heterozygosity in F$$_1$$ generation

B
Check heterozygosity in F$$_2$$ generation

C
Check independent assortment

D
Both A and B

Solution

In genetics, a test cross, first introduced by Gregor Mendel, involves the breeding of a dominant trait individual with a recessive individual, in order to determine the zygosity of the former by analysing proportions of offspring with the recessive phenotype. It checks heterozygosity in F$$_1$$ generation.
Question 5
1 / -0

Choose the correct statement about mutations.

A
Rates tend to be very low in most populations

B
Rates tend to be high in most populations

C
Irreversible

D
Only certain gene locations are affected

E
none of the above
Question 6
1 / -0

The total number of chromosomes in an organism with haploid number of 18 would be

A
18

B
16

C
26

D
36

E
46

Solution

The haploid number (n) of chromosomes in gametes is one-half the diploid number (2n) of chromosomes in the somatic cells of organisms of the same species. Therefore, total number of chromosomes in an organism would be 36 (18*2).
Therefore, the correct answer is option D.
Question 7
1 / -0

Mutation is

A
Change in gene frequency

B
Genetic drift

C
Change in base pairs in DNA molecule

D
Environmental mechanism of evolution

Solution

DNA is made up of nucleotide bases. The mutation causes changes in these bases, thereby changing the DNA sequence and information stored in it.
So, the correct answer is 'Change in base pairs in DNA molecule'.
Question 8
1 / -0

Mutation refers to sudden change in

A
Phenotype

B
Maturation time

C
Metabolic rate

D
Genetic make up

Solution

Mutations cause changes at gene/DNA level and thus mutation refers to sudden change in the genetic make up.

So, the correct answer is 'Genetic make up'.
Question 9
1 / -0

Multiple effects of a gene is known as

A
Polygenesis

B
Pleiotropy

C
Linkage

D
Epistasis

E
Nondisjunction

Solution
Question 10
1 / -0

Consider the following pedigree over four generations and mark the correct answer below about the inheritance of haemophilia.

A
Haemophilia is X-linked dominant

B
Haemophilia is autosomal dominant

C
Haemophilia is X-linked recessive

D
Haemophilia is Y-linked dominant

Solution

Haemophilia is an X-linked recessive trait. It is an inherited bleeding disorder characterized by the presence of low levels of clotting factors resulting in the inability or impaired ability of blood clotting. In the given pedigree chart the trait for is haemophilia transmitted from father to the son when the father is affected and from mother to the son when the mother is a carrier. Thus, the correct answer is option C.

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Re-Attempt Weekly Quiz Competition

Principles of Inheritance and Variation Test - 28

Result

Principles of Inheritance and Variation Test - 28

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SHARING IS CARING

Question 1

Darwin

Bateson

Lamarck

Weismann

Solution

Question 2

Hybrid cross

Reciprocal cross

Test cross

Monohybrid cross

Solution

Question 3

Normal males

Normal females

Affected males

Affected females

Solution

Question 4

Check heterozygosity in F$$_1$$ generation

Check heterozygosity in F$$_2$$ generation

Check independent assortment

Both A and B

Solution

Question 5

Rates tend to be very low in most populations

Rates tend to be high in most populations

Irreversible

Only certain gene locations are affected

none of the above

Question 6

18

16

26

36

46

Solution

Question 7

Change in gene frequency

Genetic drift

Change in base pairs in DNA molecule

Environmental mechanism of evolution

Solution

Question 8

Phenotype

Maturation time

Metabolic rate

Genetic make up

Solution

Question 9

Polygenesis

Pleiotropy

Linkage

Epistasis

Nondisjunction

Solution

Question 10

Haemophilia is X-linked dominant

Haemophilia is autosomal dominant

Haemophilia is X-linked recessive

Haemophilia is Y-linked dominant

Solution

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