Theories regarding the birth of the solar placement argon of two types: the blasting hypothesis and the evolutionary hypothesis. Basically, the catastrophic surmise contends that the solar transcription was formed as a result of a singular event. One popular theory somewhat the catastrophic creation of the solar system is that it was created by a collision between the sun and another celestial body of comparable size. The evolutionary theory claims that the solar system was created by a gradual process: "To some, though, it seemed more natural, and slight fortuitous, to imagine a long-drawn-out and noncatastrophic process as occasioning the birth of the solar system." Newton suggested that the solar system resulted from the gradual condensation of a thin cloud of gas and dust. Elaborating on that theory, modern astronomers picture that the force initiating the condensation was caused by the explosion of a supernova.
Theories about the creation of the planets have fluctuated from evolutionary to catastrophic and back.
Pierre Simon de Laplace's nebula theory contends that a rotating cloud of issue threw off rings of square from its equator. These donut-shaped rings condensed to form planets while the larger cloud of matter slowed down, contracted, and became the sun. Laplace's theory, suggested in 1796
When cells divide imperfectly, abnormalities result. Children with Down's syndrome are found to have cells with 47 chromosomes instead of the normal 46. The absence seizure of the required number of chromosomes can lead to mental retardation. abject or damaged chromosomes also can lead to ingrained disease.
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