Multiple choice

Lethal genes are those which cause

  1. death of heterozygous infant being formed

  2. survival of the individual in which they are present

  3. death of homozygous infant being formed

  4. None of these

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Lethal alleles (also referred to as lethal genes or lethals) are alleles that cause the death of the organism that carry them. They are usually a result of mutations in genes that are essential for growth or development. Lethal alleles may be recessive, dominant or conditional, depending on the gene or genes involved.