HNR 247 lecture 9 notes
HNR 247 lecture 9 notes HNR 247
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This 2 page Class Notes was uploaded by Julia Dang on Tuesday February 9, 2016. The Class Notes belongs to HNR 247 at Grand Valley State University taught by Dr Debra Burg in Winter 2016. Since its upload, it has received 11 views. For similar materials see Molecules of Life in Perspective in OTHER at Grand Valley State University.
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Date Created: 02/09/16
Lecture 9 HNR 247 2-9-16 Be familiar with Collier article. A. Down syndrome (trisomy 21)- example of nondisjunction B. Chromosome painting. a. Take a florescent dye and attach it to base pair a particular gene. b. (FISH) Florescence in situ hybridization C. Genetic variety- a. Important because inbreeding is bad. b. Important because if we were all genetically identical then if one natural disaster/disease, then we’d all be prone to the disease in the same way. i. Like when you breed dogs, they always have some sort of issue that their breed is prone to. D. Eukaryotes- 3 ways to generate a variety: a. Sexual reproduction- sperm and egg b. Recombination – sister chromatids swap parts of the chromosome- i. 1 cell 4 gametes ii. They’re 4 versions instead of 2 versions c. Point mutations – single base change i. Variation in protein- 1. it can improve the function, 2. have no impact at all 3. It can be harmful- have less or no function. E. Bacteria (prokaryotes) a. No sexual repro- they’re haploids b. All they do is mutations. i. They do replicate and in that quick time there are mutations that happen F. Natural selection: survival of the fittest- survival to reproduction. a. Having variety in the population and survival of many genetic variations. b. Mutations have an impact on this. They’re spontaneous. It may help you survive or not. Characteristics resulting from single gene- Mendelian genetics. Polygenetic trait- bell shape curve. Mendel- Augustinian monk o Follow the pursuit of truth through learning. o Studied the pea plants for 9 years- published in 1865 o Heredity units= factors genes o Genes have alternate forms alleles o Gene= DNA sequence Slight variation in sequence. (mutation) o Law of Segregation: when you make gametes it has 2 copies separate from each other. o Law of independent assortment: when the copies separate from each other, they randomly assort into gametes. o Dominant allele: observable trait o Recessive Allele: not observable unless occurs alone.
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