Home
Class 12
BIOLOGY
Assertion (a) :- An organism with lethal...

Assertion (a) :- An organism with lethal mutation may not even develop beyond the zygote stage.
Reason (R ) :- All types of gene mutations are lethal .

A

If both Assertion & Reason are true and the reason is the correct explanation of the assertion.

B

It both Assertion & Reason are true but the reason is not the correct explanation of the assertion.

C

If Assertion is true statement but Reason is false.

D

It both Assertion and Reason are false statements.

Text Solution

Verified by Experts

The correct Answer is:
c
Mutations are sudden and abruptive equatative or quantitative change in the genetic material of an organism. According to their effects on the phenotye mutations may be classified as lethals. Subvitals and supervitals. Lethal mutations results in death of the cells or organism in which they occur. the organism may be not develop beyond the zygote stage. Subvital reduces the chances of survival . Supervital mutations results in the improvement of biological fitness under cetain condition. there may also be utations which are neither harmful nor beneficial to the organisms in which they occur.
Promotional Banner

Similar Questions

Explore conceptually related problems

Assertion: During mutation a gene may undergo a sudden change in expression due to the change in composition. Reason: Some genes mutate more than one and have more than two alleles.

Assertion (A): Inactive stage in the cell cycle is quiescent stage. Reason (R ): All the cells pass through quies cent stage.

Assertion : A single mutation may produce a new species . Reason : Mutation may cause major variation in genetic material and these are inheritable .

Assertion (A): Speciation is the process of formation of a new species from a pre-existing one. Reason (R): Mutation plays a role in speciation

Assertion : - Somatic hybrid can be developed only through genetic engineering. Reason :- Apomictic seed can be produced by mutation.

Assertion :- The development & differentiation of embryo into adult organism are the result of coordinated regulation of expression of several sets or genes. Reason : The expression of all genes are not required simultaneously during development of organism.

Assertion: Nuclear waste is an extremely potent pollutant and has to be dealt with utmost caution. Reason: At high doses, nuclear radiation is lethal but at lower doses, it creates various disorders, the most frequent of all being cancer.