Which phenomena leads to the variation in $DNA$
Mutation
Linkage
Both $(a)$ and $(b)$
Mitosis
The salivary gland chromosomes in the dipteran larvae are useful in gene mapping because
Which one of the following mutation partially or fully reverses the harmful effects of previous mutation
Linkage was first observed in
The two organelles responsible for cytoplasmic inheritance among eukaryotes are
Genetic counsellors can identify heterozygous individuals by