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Biology 1 Notes 3/21

by: jsmith22

Biology 1 Notes 3/21 BIOL 11900

Marketplace > Ithaca College > Biology > BIOL 11900 > Biology 1 Notes 3 21

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About this Document

Covers basic classical genetics and Sex linked genetics
Fundamentals of Biology I: Cells and Bodies
Professor Rebecca Brady
Class Notes
Biology, Genetics
25 ?




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This 1 page Class Notes was uploaded by jsmith22 on Sunday April 3, 2016. The Class Notes belongs to BIOL 11900 at Ithaca College taught by Professor Rebecca Brady in Spring 2016. Since its upload, it has received 27 views. For similar materials see Fundamentals of Biology I: Cells and Bodies in Biology at Ithaca College.


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Date Created: 04/03/16
● Classical Genetics ○ Genes and environment influence each other ○ What is a gene? ■ Stretch of DNA that codes for a single peptide  chain ■ Comes in different versions or alleles ■ Everyone has the same genes, only different  versions  ○ Some traits are controlled by a single locus (gene) ■ Phenotype­ what you look like ■ Genotype­ what alleles you have ● Written as 2 letters ■ Dominant alleles mask the phenotype of recessive  alleles  ● Only need one copy of dominant  alleles to control phenotype ○ Mendelian Genetics ■ True­breeding, another word for homozygous ■ Cross breed, mixing two homozygous  ● Results in heterozygous pair ■ Alleles segregate randomly among offspring  ● Equal chance of each parent  passing on each allele ■ When loci are on different chromosomes, they will  separate independently  ● Law of Independent Assortment  ■ If alleles segregate randomly, we can predict  outcomes using probability  ● And­ multiply ● Or­ add ■ Individuals expressing the dominant phenotype  have ambiguous genotypes ■ A testcross allows you to determine genotype of the parents by looking at the phenotype of the offspring  ○ Sex Stuff ■ X and Y chromosomes determine phenotypic sex in humans ● Autosomes­ non­sex chromosomes ● Sex Chromosomes­ contains genes  that cause sexual differentiation  ● X chromosome also contains non­ sex related genes ● Sex­linked genes­ genes are on the  X chromosome, so inheritance is linked to sex


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