MCQ
Which of the following undergoes change in mutation?
- AChromosome
- BStructure of gene
- CSequence of gene
- DAny of the above
Explanation:
Mutations are the changes in chemical structure of genes which are manifested in altered protein structure and function. It can alter the sequence of nucleotides in a gene by inversion, deletion, substitution or frameshift changes. DNA replication errors or chemical and physical mutagens disturb the structure of nucleotides and mutate the gene. Structural (inversion, deletion, duplication, translocation) and numerical (aneuploidy, polyploidy) changes in chromosomes are called as chromosomal aberrations which produce the same phenotypic effect as gene mutations. Thus, mutations can change sequence, structure of gene as well as structure of chromosomes.
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Statement $2$: Father is not responsible for the sex of the child
$I.$ Species diversity increases as we move away from the equator towards the poles.
$II.$ Stellar's sea cow and passenger pigeon got extinct due to overexploitation by man.
$III.$ Lantana and Eichhornia are invasive weed in India.
$IV$. The historic convention on biological diversity was held in $1992 .$
Choose the option containing correct statements.