The medulla oblongata is the portion of the brainstem that blends with the spinal cord after passing through the foramen magnum.
The medulla oblongata is the lowest part of the brainstem and is continuous with the spinal cord after passing through the foramen magnum. The medulla oblongata is cone shaped and it contains several nerve cells which controls many autonomic (involuntary) functions such as breathing, sneezing, heart and blood vessel activity, swallowing and digestion. The medulla oblongata is the center for respiration and circulation and it also assist in transmitting messages between various parts of the brain and the spinal cord.
Answer:
1. Genetic engineering is when a gene is physically removed from one organism and putting it into another.
2. A description of DNA is organic chemical that contains the genetic instructions for living things to function. The role of DNA is develop, survive and reproduce.
<span>Genetic
drift is a predictable event alongside with natural selection, mutation, and
migration. In every era of generation, organisms’ genes may be passed on to its
species, to further the usable genetic trait while the not-so-used genes are
trashed away.</span>
Answer:
I'm not sure if this is correct but I think it's C
Answer: C. Homologous chromosomes are separated in meiosis but not in mitosis.
Explanation: There are two main types of division that take place in eukaryotic cells, mitosis, and meiosis. Mitosis is the type of division that is used for growth, repair, and replacement of tissues. Therefore it is not necessary that the cells have different chromosome numbers or are varied genetically in the daughter cells in the case of mitosis.
Meiosis is the division that takes place to form the gametes for sexual reproduction. It is important in the first stages of meiosis I, to introduce variation and to halve the chromosome number.
Chromosomes numbers are halved (from 46 to 23) during meiosis I because the gametes (sperm and egg) come together and fuse during fertilization to form a zygote. When this fusion occurs (23 from the zygote and 23 from the egg), the chromosome number needs to be returned to that of the parent cell (46).
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Genetic variation is introduced during synapsis which only occurs in meiosis, not mitosis. Homologs exchange genetic information during crossing over of synapsis. Entire chromosomes also separate during meiosis I.
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At the end of meiosis, four genetically unique cells are produced with half the number of chromosomes as the parent cell (23 cromosomes) . After the process of mitosis is completed, two cells genetically identical to each pther are produced and have the same number of chromosomes as the parent cell (46 cromosomes).
Genetic variation is actually important because of changing environmental conditions.
