When either trait in a dihybrid cross is homozygous recessive, what is that gene?

Organisms are classified, or grouped into categories, based on similarities in their characteristics and/or evolutionary relationships. the study of how organisms are classified is known as

Which part of the cell is affected by the movement of molecules through diffusion, osmosis and active transport?

Select the word from the list that best fits the definition a system made of 25 satellites