Study Guide for Science Test


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Essay #: 070527
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Study Guide for Science Test
Definition of Key Terms
1. Meiosis - meiosis produces sperm and eggs for sexual reproduction. In this process, chromosome duplication is followed by two divisions that result in a set of four cells, each of which has half the normal complement of DNA (Trefill and Hazen 465). Crossing over between pairs of chromosomes results in the shuffling/mixing of genetic material; and this process results in chromosomes with a new genetic makeup (Trefill and Hazen 463).
2. X and Y chromosome – A chromosome is a specific length of an organisms DNA that encloses a protein core (Trefill and Hazen 503). The X chromosome is associated with female characteristics and the Y chromosome is associated with male characteristics. The...
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..... are born than can possibly survive. Natural selection also provides a mechanism for a species to change its traits in response to changes in the environment. It is neither controlled nor rapid like artificial selection - the process of breeding controlled by humans. Thus natural selection is a process that operates over long time periods to produce gradual changes in populations, not a process that can explain short term variations in a few individual traits. So, natural selection relates to changes in populations over time (Trefill and Hazen 541-542).
Works Cited
Trefil, James S. Encyclopedia of science and technology. Taylor
& Francis, 2001.
Trefill, James and Robert Hazen. The Sciences: An Integrated
Approach 6 Edition, Wiley, 2010.