Repetitive sequences are stretches of $DNA$ with repeated bases many times in a genome, but

$(a)$ These sequences are of no transcriptional function
$(b)$ These are associated with euchromatin region
$(c)$ These helps to identify a person on the basis of its $DNA$ specificity

Hereditary element may be attached to chromosome or found free in cytoplasm is called

Which step of translation does not consume high energy phosphate bond?

A male human is heterozygous for autosomal genes $A$ and $B$ and is also hemizygous for hemophilic gene $h$. What proportion of his sperms will be $abh$

In tryptophan operon