Answer:
meiosis
Explanation:
Down syndrome is an abnormality that occurs on chromosomes 21, it occurs because chromosomes 21 cannot be separated in meiosis, the pair of chromosomes 21 do not separate and go together to one of the daughter cells. In this way, the oocyte or the resulting sperm will have 24 chromosomes instead of 23. When in conception that oocyte or sperm joins the germ cell of its partner that contributes the 23 chromosomes, the total sum of chromosomes that will have the first cell of the new conceived being will be 47.
Yes, crossing over does not occur during mitosis. As mitosis is simply the duplication of cells, there is no gene variation that comes from crossing-over.
The two principles that makes the scientific method a unique process are: The first principle is that events in the natural world have natural causes. The second is uniformity which is the idea that the fundamental laws of nature operate the same way at all places and at all times. Scientific method is the sequence of phases trailed to solve problems as well as collecting data, formulating a hypothesis, testing it and stating conclusions. The scientific method has five straightforward stages and plus one feedback step: 1. Make an statement 2. Ask an interrogation 3. Arrange a testable description 4. Make a forecast based on the theory 5. Test the forecast 6. Repeat the use the outcomes to create new hypotheses or calculations.
Oxegyn comes from plants that aid in in well...living. Meat from live stock in animals that we use to feed ourselves. Sorry if it's not the answer you are looking for. :)
