How does an error in meiosis result to cri-du-chat.

Meiotic errors are alterations of a cell's chromosome number or structure. Chromosomal alterations happen in both mitosis and meiosis. But in some ways meiosis provides more opportunities for errors. This is because the three sources of genetic variation in meiosis can also be opportunities for errors. Crossing over in prophase I and independent assortment in anaphase I and anaphase II are major sources of genetic variation among sexually reproducing organisms. Each sexually reproduced organism is genetically unique, unlike the genetically identical offspring in mitosis. The benefits of having multiple sources of genetic variation are diversity and enhanced adaptability to changing environments. But crossing over and independent assortment can also provide opportunities for errors, resulting in gametes with altered structures or numbers of chromosomes. The consequences of meiotic errors can be mild or fatal; they will be discussed in the last section.

step 1 ammonium can be absorbed by plants, but some is converted into nitrates which are better for plants to absorb. this is called nitrification. 2. step 2 the deer eats the plants and uses the nitrogen-containing proteins for cell growth. 3. step 3 bacteria in the soil conduct nitrogen fixation to convert nitrogen gas from the atmosphere into ammonium. 4. step 4 some of the nitrates are absorbed back into plants, but denitrification breaks down the nitrates into nitrogen gas released back into the atmosphere. 5. step 5 nitrogen is found in the urine, which gets broken down into ammonium through the process of ammonification. 6. step 6 plants absorb the ammonium and begin assimilation, the process to add the nitrogen to protein.

and after water is usually warmed by the sun the water temperature raises and then evaporates .