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  4. Assertion: An organism with lethal mutation may not even develop beyond the zygote stage. Reason: All types of gene mutations are lethal.

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Q. Assertion : An organism with lethal mutation may not even develop beyond the zygote stage.
Reason : All types of gene mutations are lethal.

AIIMSAIIMS 2006Principles of Inheritance and Variation

Solution:

Organisms with lethal mutation bear lethal genes that result in the death of the individual carries them.
The completely lethal genes usually cause death of the zygote.
Mutation is a sudden heritable change in the sequence of genes occurring on the chromosomes. Mutation may be beneficial, normal, sub-lethal or lethal.