<h2>Answer:</h2>
The correct arrangement of steps that occur in producing neuron cells.
The steps are from 1 to 4 according to arrangement.
- Genes that lead to the production of undifferentiated precursor neurons are activated.
- Stem cell arise from the inner mass of cells.
- Signalling factors trigger differentiation in stem cells.
- Signalling factors causes precursor neurons to produce neurons.
the cells split into two identical daughter cells during cytokinesis
Answer:
Its a male, without down syndrome
Explanation:
The fact that it's a male is indicated from the presence of the Y chromosome. In order for this man to have down syndrome, he would have had 3 chromosomes at 21, which he doesnt, meaning he doesnt have down.
The RYR1 gene is responsible for producing the protein ryanodine receptor 1. This protein transport calcium ions to the cells for muscle contraction. When this receptor remains open for a long time, you would expect an excess of calcium ions which would result to muscle rigidity. The excess calcium ions would also increase body temperature and produce excess acid.
Answer:
Clouds are made of microscopic droplets of water ranging from 1 to 100 microns. Although, a water droplets total size, water's density is still much greater than air, and over time the earth's gravitational pull should cause the water droplet to fall.
