Suppose that a carrier of familial Down syndrome mated with a person with a normal karyotype. Which gamete from the carrier parent could fuse with a gamete from the normal parent to produce a trisomy-21 zygote

Explanation:

Chromosomal mutations, non-point mutations or chromosomopathies are alterations in the number of genes or in the order of these within the chromosomes. They are due to errors during gametogenesis (formation of gametes by meiosis) or the first divisions of the zygote. In the first case, the anomaly will be present in all the individual's cell lines, while when the anomaly occurs in the zygote it can lead to mosaicism, thus coexisting normal cell populations with others that present chromosomal mutations.

Karyotype of human female cell in metaphase state.

These alterations can be observed during the metaphase of the cell cycle and that have their origin in breaks (clastogenic processes) of unrepaired or poorly repaired DNA chains, among other factors.

Currently, there is extensive knowledge of the human karyotype and chromosomal abnormalities. Since these alterations are genetic abnormalities, they can be transmitted to the offspring in case they affect the germ cells. It is estimated that about 60% of abortions in the first trimester of pregnancy are due to chromosomal abnormalities and 0.5% of newborns have aneuploidies. For this reason, the study of these mutations by means of a karyotype or an FISH is very useful to detect any anomaly in advance.

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.

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]