The basis for communication in anatomy and physiology assumes

The basis for communication in anatomy and physiology assumes anatomical position.  

Anatomical position is the position in which a person stands straight with his spinal cord stretched and straight, his chin remaining perpendicular with the body axis, and his feet joint side by side and his palms facing anteriorly.

This is the position which is used as the default position to explain the location and relationship of any organ or object inside body with surrounding organs. In anatomy and physiology both, anatomical position is the default position to explain the location of other organs. Thus, as any location is stated in these subjects, the position is taken to be anatomical position.  

"do a testcross with a homozygous recessive plant."

lesson summarykaryotypes a genome is the full set of all the genetic information that an organism carries in its dna. chromosomes arebundles of dna and protein found in the nucleus of a eukaryotic cell.