Arrangement of chromosomes in the order of decreasing length is termed

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 $abh$

One gene one enzyme concept means

Removal of introns and joining of exons in a defined order during transcription is called

The possibility of three letter genetic code was pointed out by