Today you learned about the structure of chromosomes and some of the conditions that arise in humans from chromosomal abnormalities.  Why do you think this lesson directly precedes a lesson on mitosis and the cell cycle (about how cells duplicate)?  Explain your reasoning using at least TWO facts/characteristics of chromosomes and information about at least ONE chromosomal disorder from today's lesson.

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A:

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A:

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A: ANSWER;-  

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A:  

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Genetic Evolution

Sexual reproduction produces distinct population variations. Heredity determines the traits and qualities to be passed down to the progeny. Over time, this variation within-species is also affected by the process of human evolution. The study of how genetic variation leads to evolutionary changes is known as genetic evolution. If a trait helps an organism to survive and reproduce, it is more likely to be passed down the generations. It is rare that such traits result in a completely distinct set of traits in descendants than the ancestral population; this can result in the emergence of a new species.