Define cell and atom​

cell is the basic unit of life and it is the smallest unit of life also

many cells combine to form tissue and tissue combine to form organs

atom is the smallest unit of matter everything is made up of small units called atoms

The cell is the smallest unit with the basic properties of life. Some tiny organisms such as bacteria and yeast consists of only one cell.

Atom is the basic building block for all matter in the universe. Atoms are extremely small and are made up of a few smaller particles.

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.