UA BSC 109 - Genetics (3 pages)

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Genetics



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Genetics

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describes genetics and genetic disorders


Lecture number:
27
Pages:
3
Type:
Lecture Note
School:
University of Alabama
Course:
Bsc 109 - Intro Biology Non Maj II
Edition:
1

Unformatted text preview:

BSC 109 1st Edition Lecture 27 Outline of Last Lecture IX Cancer treatments continued X Common cancers Chapter 19 Genetics and Inheritance I II III IV V Introductory genetics terminology Your genotype is the genetic basis of your phenotype Mendel established the basic principles of genetics Dominant alleles are expressed over recessive alleles Two trait crosses independent assortment of genes for different traits Outline of Current Lecture VI Polygenic inheritance phenotype is influenced by many genes VII Linked alleles may or may not be inherited together VIII Sex linked inheritance x and y chromosomes carry different genes IX chromosomes may be altered in number or structure X deletions and translocations alter chromosome structure XI many inherited genetic disorders involve recessive alleles Current Lecture A B XII XIII Incomplete dominance heterozygotes have an intermediate phenotype Codominance both gene products are equally expressed 1 Sickle cell gene two different alleles of hemoglobin gene 2 Sickle cell anemia must be homozygous for the gene 3 Sickle cell trait heterozygous for the gene Polygenic inheritance phenotype is influenced by many genes A Inheritance of phenotypic traits that depend on many genes B Polygneic traits are usually distributed within a population as a continuous range of values C Both genotype and the environment affect phenotype 1 Phenotype isn t determined by genotype alone 2 Environmental factors can profoundly influence phenotype Linked alleles may or may not be inherited together A Linked alleles physically located on the same chromosome B May be inherited together C May be shuffled during crossing over during meiosis 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 XIV XV XVI XVII Sex linked inheritance x and y chromosomes carry different genes A Sex chromosomes 1 23rd pair of chromosomes 2 not homologous 3 x and y chromosomes



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