Lecture 5 exam 2

Lecture 5 exam 2 - Biology 313 Lecture 15 Sept 29, 2010...

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Biology 313 Lecture 15 Sept 29, 2010
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Practice Question
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Epistasis in AaBb x AaBb dihybrids
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Extending Mendel: How is phenotype determined? A. Phenotypes can be determined by special characteristics of the alleles of a gene (Sections 5.1- 5.4) B. Phenotypes can be determined by interactions between different genes (Section 5.5, 5.6) C. Phenotypes can be determined by effects outside the nucleus (Sections 5.6 – 5.8)
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Phenotypes can be determined by effects outside the nucleus There are 4 major ways: Conditional alleles (are expressed under some conditions and not others): sex-influenced, sex-limited, temperature sensitive Genetic maternal or paternal effects Cytoplasmic inheritance Genomic Imprinting
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Conditional alleles Temperature sensitive allele: an allele whose product is only functional at certain temperatures -Usually, high temperatures denature the secondary and tertiary structures of enzymes (unfolded conformation) and thus destroy their activity
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This note was uploaded on 10/06/2011 for the course BIO 313 taught by Professor Rodermel during the Spring '11 term at Iowa State.

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Lecture 5 exam 2 - Biology 313 Lecture 15 Sept 29, 2010...

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