The sex in Drosophila melanogaster is determined by
$X$ chromosomes
$X$ and $Y$ chromosomes
Autosomes
$X$ chromosomes and autosomes
Lethal genes are
Character choosen by Mendel are located on how many chromosome
At what temperature the blood is stored in bottles
In Cooley's Anemia, the affected chain of a haemoglobin is
Distance between two linked genes upon a chromosome is measured in cross over units, is