Mutations which alter nucleotide sequence within a gene are :
frame shift mutations
base pair substitutions
both 'a' and 'b'
none of these
A.
frame shift mutations
Gene mutation or point mutation is the result of a change in the nucleotide sequence of the DNA molecule in a particular region of the chromosome. It occurs in the form of duplication, insertion, deletion, inversion or substitution of bases. Frame- shift mutation is the addition or deletion of a base that may change the reading frame of nucleotide sequence.
Base pair substitution is a type of mutation involving replacement or substitution of a single nucleotide base with another in DNA or RNA molecule.
Assertion : Clones are a group of organisms of identical genotype, produced by a single parent through asexual means.
Reason : Clones exhibit high genetic variations.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both the assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false
If both the assertion and reason are false.
A point mutation comprising the substitution of a purine by pyrimidine is called
transition
translocation
deletion
transversion
Assertion : Plasmids are double stranded extrachromosomal DNA.
Reason : Plasmids are possessed by eukaryotic cells.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both the assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false.
If both the assertion and reason are false.
Which organism was used by Beadle and Tatum to proposed one gene-one enzyme hypothesis ?
E. coli
Nostoc
Drosophila
Neurospora
