1. Differentiate between mitosis and meiosis.
2. Give a note on the structure of neuron.
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Answers
Answer:
Cells divide and reproduce in two ways, mitosis and meiosis. Mitosis results in two identical daughter cells, whereas meiosis results in four sex cells. Below we highlight the keys differences and similarities between the two types of cell division.
Explanation:
- Explanation:-
1. Mitosis results in two nuclei that are identical to the original nucleus. Meiosis, on the other hand, results in four nuclei, each having half the number of chromosomes of the original cell. In animals, meiosis only occurs in the cells that give rise to the sex cells (gametes), i.e., the egg and the sperm.
2. A useful analogy is to think of a neuron as a tree. A neuron has three main parts: dendrites, an axon, and a cell body or soma (see image below), which can be represented as the branches, roots and trunk of a tree, respectively. A dendrite (tree branch) is where a neuron receives input from other cells.
- Additional information
Mitosis is divided into five phases:
Interphase: The DNA in the cell is copied in preparation for cell division, this results in two identical full sets of chromosomes?. ...
Prophase: The chromosomes condense into X-shaped structures that can be easily seen under a microscope. ...
Metaphase: ...
Anaphase: ...
Telophase:
Average number of neurons in the human brain = 100 billion.
Average number of neurons in the octopus brain = 300 million.
Rate of neuron growth during fetal development in utero = 250,000 neurons/minute.
Diameter of a neuron = 4 to 100 microns.
