Question

Given below is the representation of a  certain event at a particular stage of a type of cell division. which is this stage ?

(a) Prophase-I during meiosis

(b) Prophase-II during meiosis

(c) Prophase of mitosis

(d) Both prophase and metaphase of mitosis

Answer 1

Correct option  (a) Prophase-I during meiosis

Explanation :

During zygotene stage of prophase-I of meiosis-I, bivalent chromosomes clearly appear as tetrads. Pachytene stage is characterised by the appearance of recombination nodules, the sites at which crossing over (exchange of genetic material) occurs between non-sister chromatids of the homologous chromosomes.