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Basic Processes of Reproduction

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Basic Processes of Reproduction
Bacteria:
Bacteria reproduce asexually, under positive environment settings this process is carried out through the method binary fission, where the most bacterial reproduction occurs in prokaryotic cells. The second method is through mitosis in eukaryotic cells except gametes (Pruitt & Underwood, 2006). Binary fission is asexual by nature and involves the splitting of the parent cells into two equal parts which once the split can be capable of independent existence (MediLexicon, 2004-2011).
Grasshopper:
Grasshoppers sexually reproduce when the male grasshopper introduces his spermatozoa through his aedeagus (reproductive organ) into the females ovipositor. The sperm sack contains a large packet of proteins known as spermatophylax that helps keep the eggs properly nourished (New World Encyclopedia, 2008). Once fertilized the female lays the eggs with her ovipositor and stomach one to two inches underground to keep them protected during the winter months until they hatch in warmer weather (New World Encyclopedia).
Fish:
Fish reproduce is, based on the location, time of year, and the presence of a proper mate (Pruitt & Underwood,
2006). Depending on the type of fish they gather in huge schools, and females expel eggs and the males follow behind discharging Milt (sperm) into the water. Some of the eggs float some sink to the bottom, and others are, laid in nests. Once the eggs are laid, they are commonly protected by one of the parents usually the male(Animal Planet).
Bear:
The reproduction of the bear is very similar to that of humans with one exception humans can mate anytime while bears only mate in the spring. The male bear mates with the female bear, and through the release of his sperm fertilizes the egg within the female. Once the egg is, fertilized it attaches itself to the wall of the uterus, and an embryo begins to grow along with the placenta (Pruitt & Underwood, 2006). Through the placenta is how the embryo receives food, oxygen, and the needed nutrients to grow. Once the baby reaches the stage to where it can survive the external conditions then it is born (Pruitt & Underwood, 2006).

References MediLexicon. (2004-2011). Binary fission. Retrieved January 19, 2012 from http://www.medilexicon.com/medicaldictionary.php New World Encyclopedia. (2008). Grasshoppers. Retrieved January 19, 2012 from http://www.newworldencyclopedia.org/entry/Grasshopper Pruitt, N. L., & Underwood, L. S. (2006).... Fish Reproduction and Growth: Other Fish: Animal Planet. Retrieved January 19, 2012 from
http://animals.howstuffworks.com/fish/fish-info2.htm…...

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