Question

the threadlike structures in the nucleus of a cell that contain genetic material are called

a. chromosomes
b. germ discs
c. ectoderms
d. phenotypes

Explanation:

Chromosomes in a cell's nucleus carry genetic material. Germ discs are related to embryonic development, ectoderms are one of the germ - layers in embryos, and phenotypes are observable traits, not the structures with genetic material.

Answer:

A. chromosomes