Question

Mutations are commonly
A) Dominant
B) Codominant
C) Recessive
D) Incomplete

Answer 1

A change in DNA sequence is called a mutation. They can occur due to DNA copying mistakes made during cell division, exposure to chemicals or any other factors.

Complete answer:
Mutations arise during-

DNA or viral replication
Mitosis
Meiosis
Mutations can also result from insertion or deletion of segments of DNA. Mutations can also result in genetic recombination.In the recessive mutation both alleles must be mutant to observe the mutant phenotype. Different forms of gene are called as alleles.The mutations play a important role in normal and abnormal processes like evolution, cancer and development of immune system.The recessive mutation results in loss of function due to inactivation of the affected gene.In a dominant mutation, the mutant phenotype is observed in a heterozygous individual carrying one normal and one mutant allele. Dominant mutations often lead to gain in function.Some alleles are associated with both dominant and recessive phenotype.
There are two types of mutations- 1.gene mutations which include insertion, substitution and deletion.2.chromosomal mutation.

Hence the correct answer is option ‘C’.

Note: The mutations can also be beneficial. Some mutations help the organisms to adapt to changes in the environment. The insertions and deletions are more harmful. A neutral mutation has no harmful effect on the organism. Mutation is the source of all genetic variation. Mutation provides raw material on which natural selection can act.