Principles of Inheritance and Variation Test

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Principles of Inheritance and Variation Test - 29

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Weekly Quiz Competition

Question 1
1 / -0

Mutation is a change that is

A
Never inherited

B
Inherited only in $$F_2$$ generation

C
Inherited

D
Responsible for plant growth

Solution

Since mutation causes changes at the DNA/gene level, and genes are inherited from parents and passed to offsprings, so these mutations will also be inherited.

So, the correct answer is 'Inherited'.
Question 2
1 / -0

Which is the main category of mutation?

A
Genetic mutation

B
Zygotic mutation

C
Somatic mutation

D
All the above

Solution

Mutation is a sudden heritable change in genes structure of an organism. The term genetic mutation covers somatic mutation as well as germinal mutation (occurring during reproduction).

So, the correct answer is 'Genetic mutation'.
Question 3
1 / -0

According to the chromosomal theory of inheritance, the hereditary unit which occurs in pair is known as

A
DNA

B
RNA

C
Proteins

D
Genes
Solution
- The chromosomal theory of inheritance states that there are certain factors that are passed on from one generation to the next in pairs.
- These factors were later described as the genes. There are two alleles of genes that are present on the homologous chromosomes.
- One of the alleles is obtained from the mother and the other allele is obtained from the father. The genes were considered as the heredity unit.
Thus, the correct answer is option D.
Question 4
1 / -0

Transposon was discovered by

A
Sutton

B
Strassburger

C
Fischer

D
McClintock

Solution

A transposable element or jumping gene is a segment of DNA sequence that can change its position within the genome, sometimes creating or reversing mutations and altering the cell's genome size. Barbara McClintock was discovered the jumping genes in maize.
Question 5
1 / -0

Which is not a genetic disorder?

A
Sickle cell anaemia

B
Down syndrome

C
Type 2 diabetes

D
ADHD

Solution

Type 2 diabetes is not genetically inherited.
Question 6
1 / -0

Sudden and a heritable change in a character/gene of an organism is

A
Selection

B
Heterosis

C
Inbreeding

D
Mutation

Solution

Sudden and a heritable change in a character/ gene of an organism is mutation. Mutation is sudden, discontinuous variation in genotype and phenotype of an organism due to change in chromosomes and genes. In addition to recombination, mutation is another phenomenon that leads to variation in DNA. A point mutation is a change of a single base pair in DNA. Some mutations involve changes in whole set of chromosomes (polyploidy) or change in a subset of chromosome number (aneuploidy). So, the material for organic evolution is mutation because mutation leads to evolution.
Question 7
1 / -0

Sickle cell anaemia is an example for ____________.

A
Point mutation

B
General mutation

C
Spontaneous mutation

D
Natural mutation
Question 8
1 / -0

When a dihybrid cross is fit into a punnett square with 16 boxes, the maximum possible number of different phenotypes available are

A
8

B
4

C
2

D
16

E
12

Solution

A dihybrid cross involves a cross between two different lines which differs in two contrasting characters. A dihybrid cross, in a Punnett square with 16 boxes leads to the formation of four contrasting characters in the second generation. For, example a plant with round yellow seed is crossed with a plant with wrinkled green seed it leads to the formation of round yellow, wrinkled yellow, round green and wrinkled green characters.
So, the correct answer is option B.
Question 9
1 / -0

In man, the blue eye colour is recessive to the brown eye colour. If the boy has brown eye and his mother is blue eyed, what would be the phenotype of his father?

A
Black eye

B
Brown eye

C
Green eye

D
Blue eye

Solution

In man, blue eyes are recessive and brown ones are dominant.
In case of human males - XY (Only X chromosome can carry genes, but Y cannot)
In case of human females - XX (Both X chromosomes will carry genes)
If the son is having Brown eyes, his expected genotype is XB Y
Genotype of mother with blue eyes is XbXb
Thus the genotype of father has to contain one B gene which had transferred to the offspring.
Genotype of father is XB Y- Phenotype is brown eyes
Question 10
1 / -0

When a plant of F$$_{1}$$ generation is crossed with homozygous dominant parent, it is known as

A
Simple cross

B
Test cross

C
Back cross

D
Special cross

Solution

Backcrossing is a crossing of a hybrid with one of its parents or an individual genetically similar to its parent, in order to achieve offspring with a genetic identity which is closer to that of the parent. It is used in horticulture, animal breeding and in production of gene knockout organisms.

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Principles of Inheritance and Variation Test - 29

Result

Principles of Inheritance and Variation Test - 29

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SHARING IS CARING

Question 1

Never inherited

Inherited only in $$F_2$$ generation

Inherited

Responsible for plant growth

Solution

Question 2

Genetic mutation

Zygotic mutation

Somatic mutation

All the above

Solution

Question 3

DNA

RNA

Proteins

Genes

Solution

Question 4

Sutton

Strassburger

Fischer

McClintock

Solution

Question 5

Sickle cell anaemia

Down syndrome

Type 2 diabetes

ADHD

Solution

Question 6

Selection

Heterosis

Inbreeding

Mutation

Solution

Question 7

Point mutation

General mutation

Spontaneous mutation

Natural mutation

Question 8

8

4

2

16

12

Solution

Question 9

Black eye

Brown eye

Green eye

Blue eye

Solution

Question 10

Simple cross

Test cross

Back cross

Special cross

Solution

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