Question

in genetics XX-XO (cockroaches ) during the crossing over stage ,(in the O sperm when the chromosomes is absent) then what will cross over.

Answer 1

Male cockroaches have only sex chromosome. There is no second sex chromosome. Half of the male gametes will carry X chromosome (A+X) while the other half being devoid of it (A+O). Crossing over occurs in homologous chromosomes. Since, only one X chromosome is present, crossing over will not take place in males.