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PBIO 1210 week 9 notes

by: Maddi Huff

PBIO 1210 week 9 notes Pbio 1210

Marketplace > University of Georgia > Plant Biology > Pbio 1210 > PBIO 1210 week 9 notes
Maddi Huff
GPA 3.7

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About this Document

These notes cover week 9 of plant biology 1. I have highlighted that vocab that will be important for the test.
Principles of Plant Biology
Class Notes
plant, Science, Biology
25 ?




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This 2 page Class Notes was uploaded by Maddi Huff on Friday October 14, 2016. The Class Notes belongs to Pbio 1210 at University of Georgia taught by Momany in Fall 2016. Since its upload, it has received 5 views. For similar materials see Principles of Plant Biology in Plant Biology at University of Georgia.


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Date Created: 10/14/16
Key- vocabulary PBIO 1210- Principles of Plant Biology Week 9 notes 10/11/16 1. Mendel’s 1 law: segregation a. Alleles are separated into gametes then reunited randomly during fertilization b. One gene c. EX: Rr x Rr d. Uses 4 Punnett square e. Offspring produced are monohybrids 2. Mendel’s 2 ndlaw: independent assortment a. The F1 offspring produced in this cross were monohybrids b. The F2 offspring segregated 3:1 c. 4 gamete types d. EX: RrYy x RRYY e. Offspring produced are dihybrids f. Uses 16 Punnett square g. 3. Gene location a. Unlinked traits- traits that do not affect one another i. They are located on different chromosomes b. Linked traits- traits that affect one another i. They are located on the same chromosome ii. EX: on a pea plant, height and seed shape are linked. T/R and t/r will always line up so the plants are either tall with round seeds or short with constricted seeds. 4. Prophase I a. Homologous chromosomes align and exchange genetic material through crossing over b. The further apart and more independent genes are, the more likely they are to follow Mendel’s expectation c. Sometimes, one trait can be controlled by many genes i. EX: Kernel color in wheat: Two genes- Each has a dark and a light allele 5. From genotype to phenotype a. Some heterozygotes have an immediate phenotype i. EX: RR= red, rr= white, Rr= roan ii. This is NOT blending b. Incomplete dominance- when one allele does not completely dominate another allele, and therefore results in a new phenotype i. EX: RR x rr = Rr 10/13/16 Genetics 1. Evolution – change in the genetic composition of a population over time 2. Plato’s Essentialism a. Eidos= form or idea, ideal form imperfectly imitated in real life b. EX: equilateral is the essence of a true triangle Key- vocabulary c. Believed that life is permanent and unchanging d. Aristotle expanded this notion to species 3. 1600S: Ussher calculated the date of creation by studying the bible a. He decided life began in 2002 BC b. Geological evidence later proved that the world is much older c. Buffon, in 1779, predicted 168,000 years’ old d. We now believe life on earth to be 4.5 million years old. 4. Catastrophists (Cuvier) a. Believed that the days of creation from the bible represent long periods of time with periodic upheavals that wiped out life on Earth i. EX: earthquakes, floods, etc. b. Agassiz believed that life was recreated after each catastrophe c. Each iteration was considered to be more complex 5. Uniformitarianism a. Idea presented by Hutton and Lyell b. States that Earth’s phenomena are due to natural causes that can still be observed i. EX: wind and water c. Catastrophes not needed to explain fossil record d. Instead, ongoing processes i. View inspired Darwin, who applied it to organisms


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