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Essential Genes & Lethal Genes MCQ - Practice Questions with Answers
Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET
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5 Questions around this concept.
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Assertion:Survival of heterozygous genes is unaffected in case of recessive lethal genes.
Reason: The expression of recessive lethal genes is in homozygous conditions only.
Read the following statements
STATEMENT i): Housekeeping genes are essential genes.
STATEMENT ii): A good example of dominant lethal alleles that are seen in humans is the rare – Huntington’s disease.
Choose the correct option:
Alleles that produce a non-functional and harmful lethal allele by a mutation in an individual is
NEET 2025: Syllabus | Most Scoring concepts | NEET PYQ's (2015-24)
Concepts Covered - 1
Essential Genes & Lethal Genes
- Essential genes are those that may result in lethal phenotype when mutated.
- Many genes in an organism’s genome are needed for survival. If an allele makes one of these genes nonfunctional, or causes it to take on an abnormal, harmful activity, it may be impossible to get a living organism with a homozygous (or, in some cases, even a heterozygous) genotype.
- Such genes are called lethal genes.
- Some alleles associated with human genetic disorders are recessive lethal.
- Some human disorders are also caused by dominant lethal alleles.
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