10 Oct 07

10 Oct 07 - Before Mendel Rules of Inheritance NOT known...

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Unformatted text preview: Before Mendel Rules of Inheritance NOT known Other hypotheses: Blending inheritance (different traits in parents produce intermediate form of trait in offspring) Inheritance of acquired characteristics (Lamark: genetic determinants modified through use --> passed to offspring) KEY CONCEPTS Mendel discovered that in garden peas, individuals have two alleles, or versions, of each gene. Prior to the formation of eggs and sperm, the two alleles of each gene separate ( segregate ) so that one allele is transmitted to each gamete. Non-disjunction of the X chromosome during meiosis I in a female germ cell results in which of the following? A. Two gametes with an n + 1 chromosome number B. Two gametes with an n - 1 chromosome number C. Two gametes that could, if fertilized, result in a monosomic disorder called Kleinfelter syndrome D. Two of the above are correct E. All of the above are correct Klinefelter Syndrome (XXY) Symptoms Include: Small testicals Development of breasts Low libido Infertility Female body hair distribution Trisomy Mendel and the Gene In 1865, Gregor Mendel worked out the rules of inheritance through a series of experiments on garden peas. Mendels Experiments with a Single Trait A trait is any characteristic of an individual organism. Heredity is the transmission of traits from parents to their offspring. What Questions Was Mendel Trying to Answer? Mendel was addressing two basic questions: Why do offspring resemble their parents? And, How does transmission of traits occur? Garden Peas Serve as the First Model Organism in Genetics Mendel chose a common garden pea ( Pisum sativum ) as his model organism because a. it is easy to grow, b. is inexpensive, and c. has a relatively short reproductive cycle. Garden Peas Serve as the...
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10 Oct 07 - Before Mendel Rules of Inheritance NOT known...

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