Function of mitochondriaone function of chromatin

The most prominent roles of mitochondria are to produce the energy currency of the cell, ATP (i.e., phosphorylation of ADP), through respiration, and to regulate cellular metabolism

chromatins primary function is packaging long DNA molecules into more compact, denser structures.

Explanation:

The main function of the mitochondria is to provide energy for cellular activity by the process of aerobic respiration. In this process, glucose is broken down in the cell's cytoplasm to form pyruvic acid, which is transported into the mitochondrion.

"do a testcross with a homozygous recessive plant."

that is wrong, its not thymus.