Lecture 7 SRR F-2011

Lecture 7 SRR F-2011 - Biology 313 Lecture 7 Sept 7, 2011...

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Biology 313 Lecture 7 Sept 7, 2011 Columbia University (NYC) / Morgan Drosophila Lab
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QUIZ
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Problems (Ch 4 To date: Edition 4) Concept Checks: 1-3 Worked Problems: 2 Comprehension/ Application Questions /Problems: 1-6, 8, 20
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A central question after rediscovery of Mendel in the early 1900’s: Why are Mendel’s ratios sometimes not observed? One reason: some traits are on sex chromosomes
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Chapter 4: Sex determination & sex-linked characteristics 1. Mechanisms of sex determination A. Chromosomal B. Genic C. Environmental D. Human sex determination
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Chapter 4: Sex determination & sex-linked characteristics 1. Mechanisms of sex determination A. Chromosomal B. Genic C. Environmental D. Human sex determination
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Genic Sex Determination Sex is determined by genes at one or more loci, but there are no obvious differences in the chromosomes of males and females -occurs in some plants, fungae, protozoa
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Environmental Sex Determination Sex is determined fully or in part by environmental factors e.g, temperature that occurs during embryonic development determines whether a turtle will be male or female (warm temps, a female; cool temps, a male), REGARDLESS of what sex chromosomes are present
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Lecture 7 SRR F-2011 - Biology 313 Lecture 7 Sept 7, 2011...

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