Mutations produce random changes in an organism's genetic code. Mutations can occur in non-reproductive cells and then they will not be passed to the next generation, therefore will not contribute to variation. Only mutations that occur in reproductive cells are passed on to the next generations and contribute to genetic variation in a population.
25% is the probability of a homozygous recessive offspring if both parents are heterozygous.
<span> limiting factor </span>
<span>A limiting factor is anything that is in short supply in the environment and therefore limits life processes</span>
The investment in education and training for people.
