Barr Body & Lyon Hypothesis MCQ - Practice Questions with Answers

In the cytoplasm of female

In the cytoplasm of male

In the nuclei of female

In the nuclei of male

Replication inhibition
 

Thymine dimer formation 
 

Unwinding of DNA strand 
 

All of the above 
 

Both Assertion (A) and Reason (R) are the true and Reason (R) is a correct explanation of Assertion (A).

Both Assertion (A) and Reason (R) are true but Reason (R) is not a correct explanation of Assertion (A).

Assertion (A) is true and Reason (R) is false.

Assertion (A) is false and Reason (R) is true.

Regulation of gene expression in response to dosage imbalances

A process that eliminates extra copies of genes

A mechanism to ensure equal expression of X-linked genes in males and females

An epigenetic modification that silences genes

 A condensed, inactive X chromosome in females

An extra copy of an X chromosome

A regulatory protein involved in dosage compensation

A structure found in males that compensates for the lack of a second X chromosome

The Lyon Hypothesis explains the formation of Barr Bodies.

The Lyon Hypothesis explains how dosage compensation occurs in males.

The Lyon Hypothesis proposes random X chromosome inactivation in females.

The Lyon Hypothesis explains the formation of Y chromosomes.

Humans

 Fruit flies (Drosophila melanogaster)

Cats (Felis cactus)

Birds (Aves)

The process by which the expression of X-linked genes is balanced between males and females

The process by which a gene's expression is regulated by the number of copies of the gene in the genome

The process by which the X chromosome is replicated during the cell cycle

The process by which a gene is mutated and loses its normal function

One

Two

Three

None

Mammals

Drosophila

Males of Drosophila

All of these