Question
During meiosis crossing over occurs at
pachytene
zygotene
leptotene
diakinesis
Solution
A.
pachytene
During pachytene stage, crossing over takes place. It is exchange of equal segments of non-sister chromatids belonging to homologous chromosomes. The chromosome pair (i.e. bivalent) consists of four chromatids and thus crossing over takes place at four stranded stage.
