Question
Biology Question on cell cycle and cell division
Crossing over occurs in
A
Diplotene
B
Leptotene
C
Zygotene
D
Pachytene
Answer
Pachytene
Explanation
Solution
Crossing-over is responsible for inducing variability in parents and offsprings. It involves an exchange of equal segments of non-sister chromatids belonging to two different but homologous chromosomes. Crossing over is seen in pachytene of prophase-I. Only two of the four chromatids take part in crossing over. The other two are called non crossovers.