UNT BIOL 3451 - Extensions and Exceptions to Mendelian Genetics (4 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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Continued look at the exceptions of Mendelian Genetics including pleiotropy, X-linked genes, and how multiple genes can interact to cause the manifestation of different phenotypes.


Lecture number:
6
Pages:
4
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 6 Outline of Last 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 Outline of Current Lecture I 4 8 Phenotypes Are Often Affected by More Thank One Gene II 4 9 Complementation Analysis Can Determine If Two Mutations Causing a Similar Phenotype Are Alleles of the Same Gene III 4 10 Expression of a Single Gene May Have Multiple Effects IV 4 11 X Linkage Describes Genes on the X Chromosome V 4 12 Sex Limited and Sex Influenced Inheritance and Individual s Sex Influences the Phenotype VI 4 13 Genetic Background and the Environment May Alter Phenotypic Expression VII Current Lecture I 4 8 Phenotypes Are Often Affected by More Thank One Gene Most phenotypes come from many pathways of different enzymes i More common ii Affected by more than one gene iii Mendel only reliable within genotypes not from genotype to phenotype Epistasis one gene s alleles mask the effects of another gene s alleles i Describes situation in which a gene can mask the phenotypic effects of another gene ii Often arise because two or more different proteins participate in a common cellular function 1 Colorless precursor enzyme C colorless intermediate enzyme P purple pigment Recessive epistasis Dominant allele in one genetic locus masks the expression of the alleles in the second locus 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 II III IV i Summer squash much more complicated 1 Includes color shape ii Coat



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