UNT BIOL 3451 - Extensions and Exceptions to Mendelian Genetics (6 pages)

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Extensions and Exceptions to Mendelian Genetics



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Extensions and Exceptions to Mendelian Genetics

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Began going through the different exceptions to Mendelian genetics: incomplete dominance, partial dominance, and wild types.


Lecture number:
5
Pages:
6
Type:
Lecture Note
School:
University of North Texas
Course:
Biol 3451 - Genetics
Edition:
1
Documents in this Packet

Unformatted text preview:

BIOL 3451 1st Edition Lecture 5 Outline of Last Lecture I 3 3 Mendel s Dihybrid Cross Generated a Unique F2 Ratio II 3 4 Trihybrid Cross Demonstrates that Mendel s Principles Apply to Inheritance of Multiple Traits III 3 5 Mendel s Work was Rediscovered in the Early Twentieth Century IV 3 6 Independent Assortment Leads to Extensive Genetic Variation V 3 7 Independent Assortment Leads to Extensive Genetic Variation VI 3 8 Chi square Analysis Evaluates the Influence of Chance on Genetic Data VII 3 9 Pedigrees Reveal Patterns of Inheritance of Human Traits Outline of Current Lecture I 4 1 Alleles Alter Phenotypes in Different Ways II 4 2 Geneticists Use Variety of Symbols for Alleles III 4 3 Neither Allele is Dominant in Incomplete or Partial Dominance IV 4 4 In Codominance the Influence of Both Alleles in a Heterozygote Is Clearly Evident V 4 5 Multiple Alleles of a Gene May Exist in a Population VI 4 6 Lethal Alleles Represent Essential Genes VII 4 7 Combinations of Two Gene Pairs Involving Two Modes of Inheritance VIII 4 8 Phenotypes Are often Affected by More Thank One Gene Current Lecture Chapter 4 Intro Neo Mendelian genetics extensions from his original experiments o The exceptions extensions o These ratios did not conform to what Mendelian did before I 4 1 Alleles Alter Phenotypes in Different Ways Alleles alternative forms of a gene are called o Mutant form of gene that causes differences Mutation source of all alleles Wild type most frequently occurring in nature o Doesn t mean it s the best maybe at one time it was but not now adaptation o Frequently are dominant but not always i e Huntington allele Huntington s disease These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Mutation o Without it you would be limited to what you have right then and there there would be no variation no evolution we would still be slimes on the ground o Genetic info is modified



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