Principles of Inheritance and Variation Chapter-Wise Test 6

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which chromosomal disorder is also referred to as Trisomy 18?

Down’s syndrome
Edward’s syndrome
Patau syndrome
Turner’s syndrome
2

Edward’s syndrome is caused by trisomy of chromosome 18, leading to severe developmental issues.

Which of the following statements about mutations is incorrect?

Mutations can be harmful, beneficial, or neutral.
Point mutations always result in frameshift mutations.
Mutations can occur spontaneously or be induced by mutagens.
Some mutations may lead to genetic disorders.
2

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

Which scientist's work formed the basis for the chromosomal theory of inheritance?

Watson and Crick
Mendel and Morgan
Sutton and Boveri
Darwin and Wallace
3

Sutton and Boveri proposed the chromosomal theory of inheritance, linking chromosomes to Mendel’s principles.

Which of the following correctly describes aneuploidy?

It refers to the complete extra sets of chromosomes.
It is caused by nondisjunction during cell division.
It always results in viable offspring.
It only occurs in sex chromosomes.
2

Aneuploidy is caused by nondisjunction, where chromosomes fail to separate properly during meiosis.

Which of the following statements about polygenic inheritance is correct?

A single gene controls multiple traits.
Multiple genes influence a single trait.
It follows simple Mendelian ratios.
Polygenic traits show discontinuous variation.
2

Polygenic inheritance involves multiple genes contributing to a single trait, such as skin color and height.

What type of sex determination system is found in honeybees?

XY system
ZW system
XO system
Haplodiploidy
4

Honeybees follow the haplodiploidy system, where females are diploid (fertilized eggs) and males are haploid (unfertilized eggs).

Which of the following represents an example of a test cross?

Crossing a heterozygous individual with a homozygous dominant individual
Crossing a homozygous dominant individual with a homozygous recessive individual
Crossing an individual with unknown genotype with a homozygous recessive individual
Crossing two heterozygous individuals
3

A test cross involves crossing an individual with an unknown genotype with a homozygous recessive individual to determine its genotype.

Which genetic condition is caused by the deletion of a portion of chromosome 5?

Down’s syndrome
Klinefelter’s syndrome
Cri-du-chat syndrome
Turner’s syndrome
3

Cri-du-chat syndrome is caused by a deletion in the short arm of chromosome 5, leading to developmental abnormalities.

Which of the following correctly describes a test cross?

A cross between two dominant individuals.
A cross between an individual of unknown genotype and a homozygous recessive individual.
A cross between two heterozygous individuals.
A cross between two recessive individuals.
2

A test cross helps determine an organism’s genotype by crossing it with a homozygous recessive individual.

Which term describes an organism with identical alleles for a given trait?

Heterozygous
Homozygous
Diploid
Hybrid
2

A homozygous organism has two identical alleles for a trait.

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