The human chromosomes are divided into $7$ groups, $B$-chromosomes are
$6-12$
$1-3$
$13-15$
$4-5$
Exchange of chromosome segments between maternal and paternal chromatids during synapsis in meiosis is called
$tRNA$ is composed of about how many nucleotides
The person who discovered $'Y'$ chromosomes was
Diamond code proposal was made by
Satellite $DNA$ is present in