<span>A change in a DNA sequence is called a mutation. Mutation occurs through a large variety of processes. The most written about in the press is of course the chemical-induced mutations. There is a large variety of chemicals that can induce mutations, most of time by binding to the DNA itself and breaking it, forcing an imperfect reparation or by blocking the replication of the DNA, which will force the replication system to duplicate it imperfectly, i really hope this helps, good luck babe!!</span>
The two kinds of basic cell division include mitosis and meiosis.
Mitosis is where a parent cell divides and produces 2 genetically indentical daughters cells. So this means that when the cell division is complete, the number and even the sequence of chromosomes is exactly same as the original parent cell.
And in meiosis, also called reduction division, is where the parent cell divides and produces 4 genetically different daughter cells, which has only half of the number of chromosomes than that of the original parent cell. This process has to go through 2 times of divisions.
Mitosis is usually seen in most somatic cells, it is very important to activities such as growth, repair etc. Meanwhile, meiosis is seen in gametes, and its important for sexual reproduction.
<span>The correct answer is letter D, non-point source pollution is difficult to regulate, because its source is difficult to track.These are pollution indirectly cause by land run-off, precipitation, among others. It is also caused by rainfall or snow melt that's moving on top or through the ground. NPS can actually cause pollution on drinking water.</span>
Answer:
F2 has 600 tall plants.
Explanation:
According to Mendel's concepts, the F2 generation is formed by crossing two heterozygous plants, that is, two plants with the Aa alleles. These plants have the genes for tall plants and short plants, although they are tall because of the dominant "A" allele. In the cross between these two plants, we will have an offspring formed by 25% of short plants (aa), 25% of hom0zygous tall plants (AA) and 50% of heterozygous tall plants (Aa). As we can see, there are 3 times as many tall plants as short plants in F2's offspring. Therefore, if there are 200 short plants in a population, to know the amount of tall plants, we must multiply this value by 3. By doing this multiplication, we will know that there are 600 tall plants in F2.
