There are 4 chromosome pairs in Drosophila melanogaster. One pair of gonosomes and three pairs of autosomes.
Four
in a homologous chromosome there are two chromosomes ( a chromosome and a sister chromosome)
In humans (males and females) there are 46 chromosomes - so that means there are 23 homologous pairs.
A normal human cell has 23 pairs of chromosomes, or 46 total. or is it?