non-disjunction is a pathological event that occurs during the second anaphase in meiosis when sister chromatids are not separated. As a result one of the resulting cells will have 1 extra chromosome and the other will be 1 short. An example of a non-disjunction that can occur in humans is Down syndrome that has a frequency of about 1/1000 people. It is caused by the non-disjunction of the 21st pair of chromosomes.
Answer:
The dendrites are important for receiving action potential or other stimulation in order for neurons to become activated. Dendrites are electrical signals that receive extensions of the cytoplasm. These signals come in two fundamental forms: inhibitory and excitatory.
Explanation:
<span>Cells responsible of making energy and performing respiration within the cell. Depending on what type of organism they are found at, they can be known as Mitochondria, if they are in animals; and if they are in plants, Chloroplasts.
Mitochondria create energy for the cell by breaking down sugars, fats, and other fuels consumed by the cell.
Chloroplasts, on the other hand, since they are found at plants, convert sunlight into energy.</span>
Molten material is allowed to solidify into the final shape.
Casting defects occur during solidification:
Gas porosity
Shrinkage
Two stages of solidification:
Nucleation
Growth
