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  4. Principles of Inheritance and Variation Chapter-Wise Test 3

Principles of Inheritance and Variation Chapter-Wise Test 3

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following is a correct statement about independent assortment?

It applies to genes located on the same chromosome.
It states that allele pairs separate independently during gamete formation.
It occurs only in linked genes.
It was not part of Mendel’s original findings.
2

The Law of Independent Assortment states that alleles of different genes segregate independently during gamete formation.

Which mode of inheritance is observed in Thalassemia?

Autosomal dominant
Autosomal recessive
X-linked recessive
Y-linked
2

Thalassemia is inherited in an autosomal recessive manner, requiring two mutated alleles for the disease to manifest.

Which of the following statements about codominance is incorrect?

Both alleles are fully expressed in the heterozygous state.
Blood group AB is an example of codominance.
One allele completely dominates the other in codominance.
Codominance differs from incomplete dominance.
3

In codominance, both alleles contribute equally to the phenotype rather than one being dominant over the other.

Which of the following best describes codominance?

One allele is dominant over the other
Both alleles contribute equally to the phenotype
The heterozygote shows an intermediate phenotype
A single gene affects multiple traits
2

In codominance, both alleles contribute equally to the phenotype, as seen in the AB blood group.

Which of the following statements about genetic mutations is incorrect?

Mutations can be spontaneous or induced by external factors.
Point mutations always result in frameshift mutations.
Missense mutations change a single amino acid in a protein.
Nonsense mutations introduce a premature stop codon.
2

Point mutations do not always cause frameshift mutations; they can be silent or missense mutations.

Which scientist is credited with discovering the X-chromosome?

Thomas Hunt Morgan
Walter Sutton
Gregor Mendel
Henking
4

Henking discovered the X-chromosome while studying insect spermatogenesis.

Which of the following statements about mutations is correct?

All mutations lead to harmful effects.
Point mutations involve a single nucleotide change.
Frameshift mutations occur only due to substitutions.
Mutations do not contribute to evolution.
2

Point mutations involve a single nucleotide change and can be silent, missense, or nonsense mutations.

Which of the following is an example of multiple allelism?

Human skin color
ABO blood group system
Sickle-cell anemia
Color blindness
2

The ABO blood group system exhibits multiple allelism, involving three alleles (IA, IB, and i).

Which type of mutation results in the addition or deletion of a nucleotide, shifting the reading frame?

Point mutation
Frameshift mutation
Silent mutation
Missense mutation
2

A frameshift mutation occurs when nucleotide insertions or deletions shift the genetic reading frame.

What is the expected phenotypic ratio of a dihybrid cross in F2 generation if genes show complete dominance?

3:1
9:3:3:1
1:2:1
2:1
2

A dihybrid cross with complete dominance results in a phenotypic ratio of 9:3:3:1 in the F2 generation.

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