Fungi of the phylum ascomycota are recognized on the basis of their production of during sexual reproduction.

The correct answer will be- sac like structure called ascus.

Explanation:

Ascomycota is the largest division of the fungi with about 64000 species which reproduces by both the ways of reproduction.

The ascomycetes are named so because of their sac-like microscopic structure called ascus formed during the sexual reproductive phase of the fungi.   A single ascus produces eight ascospores through meiosis under optimal conditions which form the fungi.

Thus, sac-like structure called ascus is the correct.

answer; polycythemia is the correct answer;