Which of these is true regarding crossing over?
A. Exchange occurs between non-homologous chromosomes
B. It involves recombination nodules
C. It is not mediated by enzymes
D. It occurs during zygotene
Answer:B
Which of these is true regarding crossing over?
A. Exchange occurs between non-homologous chromosomes B. It involves recombination nodules C. It is not mediated by enzymes D. It occurs during zygotene
Explanation: Crossing over takes place during the pachytene stage of prophase I. It is enzyme mediated and involves recombination nodules. Exchange of genetic material occurs between homologous chromosomes.