If in a test tube, $mRNA$ of E. coli cells and $tRNAs$ from the body of rats are taken and sufficient number of amino acids are put, then the polypeptide synthesized will be of the nature of
Rat body cells
E. coli cells
Both E. coli and rat body cells
Polypeptide synthesis will not occur
Which of the following is the simplest amino acid
Repressor of lac-operon
The frequency of a mutant gene in a population is expected to increase, if the gene is
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 $abh$
The twenty third pair of chromosomes in man is known as