Materials move within the cell 's cytosol by diffusion, and certain materials move through the plasma membrane by diffusion. ... Diffusion: Diffusion through a permeable membrane moves a substance from an area of high concentration (extracellular fluid, in this case) down its concentration gradient (into the cytoplasm). Water, carbon dioxide, and oxygen are among the few simple molecules that can cross the cell membrane by diffusion (or a type of diffusion known as osmosis ). Diffusion is one principle method of movement of substances within cells, as well as the method for essential small molecules to cross the cell membrane.The cell membrane controls what goes in and out by having protein channels that act like funnels in some cases and pumps in other cases. ... Active transport requires energy, because protein machines actively grab molecules on one side of the membrane and push them through to the other side
Will increase, in order to adapt to the environment and reduce being spotted (exercising camouflage) a peppered moth will have a greater chance of surviving since it won't be spotted versus a white moth (which would stand out in a polluted location)
An example would be acid rain because acid is a chemical.
Answer:
Frequency of both recessive and dominant allele will change
Explanation:
Let the fox fur be determine by B gene. B is a dominant allele whereas b is a recessive allele. BB and Bb produce brown pelt whereas grey pelt is only produced in recessive condition of bb.
Normally, 80% of the population had dominant allele B and 20% had recessive allele b. But the foxes with dominant trait i.e. brown pelt were hunted due to which dominant allele would be reduced over time. Number of foxes with grey pelt would increase and they would reproduce more grey pelt foxes (bb). Eventually the frequency of recessive allele b would increase in population and frequency of dominant allele B would decrease in population.
