The average ratio of male to female individuals based on $XX$ and $XY$ type of sex determination, in total world of human population is
$3:1$
$1:3$
$1:4$
$1:1$
It is a mutagen.
Preformation theory concerning transmission of characters was given by
Example of intergenic gene interaction is$/$are
In a mutational event, when adenine is replaced by guanine, it is the case of
Which of the following type of mutation involves the reverse order of genes in a chromosome?