Question

Define about lethal genes.

Answer 1

Lethal alleles (also referred to as lethal genes or lethals) are alleles that cause the death of the organism that carries them. They are usually a result of mutations in genes that are essential to growth or development.[1] Lethal alleles may be recessive, dominant, or conditional depending on the gene or genes involved. Lethal alleles can cause death of an organism prenatally or any time after birth, though they commonly manifest early in development.

Answer 2

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a gene that in some (such as homozygous) conditions may prevent development or cause the death of an organism or its germ cells. — called also lethal factor, lethal mutant, lethal mutation.