Question

Who suggested pairing of all four chromatids whithout any chiasmata?

Answer 1

Explanation:

chiasmata) is the point of contact, the physical link, between two (non-sister) chromatids belonging to homologous chromosomes. At a given chiasma, an exchange of genetic material can occur between both chromatids, what is called a chromosomal crossover, but this is much more frequent during meiosis than mitosis.

Answer 2

Explanation:

this type of cells present in stems are on vascular bundles in veins of leaves and hard covering of seeds and nuts