Exam (elaborations)
BIO-107 test 1 Questions and Answers (100% Pass)
- Course
- Bio 107
- Institution
- Washington State University - Pullman Campus
BIO-107 test 1 Questions and Answers (100% Pass)
[Show more]
Content preview
©PREP4EXAMS@2024 [REAL-EXAM-DUMPS] Monday, July 29, 2024 12:15 PMBIO-107 test 1 Questions and Answers (100% Pass)
Microevolution - ✔️✔️Evolutionary change below the species level; Change in allele
frequencies over generations. It is called micro evolution because it focuses on
evolution in population, which is the smallest scale. (individuals do not evolve.)
3 mechanisms that cause allele change - ✔️✔️Natural seletion, genetic drift( chance
events that alter allele frequencies), and gene flow (the transfer of alleles between
populations).
Population - ✔️✔️is a group of individuals of the same species that live in the same area
and interbreed, producing fertile offspring.
Gene pool - ✔️✔️We can characterize a population's genetic makeup by describing its
gene pool, which consists of all copies of every type of allele at every locus in all
members of the population.
Fixed - ✔️✔️if only one allele exists for a particular locus in a population.
What does a population geneticist mean when he/she states that the allele for dorsal fin
shape is fixed in a population of great white sharks? - ✔️✔️Means there is no
homozygous/heterozygous makeup for that allele makeup. There is only one allele in
the population to contribute to the shark's dorsal fin shape.
Differential reproduction - ✔️✔️The idea that there is variation in the number of offspring
that individuals within a population produce, is known as Differential Reproduction or
Differential Reproductive Success
Genetic Drift - ✔️✔️Chance events can also cause allele frequencies to fluctuate
unpredictably from one generation to the next, especially in smaller population.
2 kinds of genetic drift. Bottleneck effect and founder effect
1
, ©PREP4EXAMS@2024 [REAL-EXAM-DUMPS] Monday, July 29, 2024 12:15 PM
Explain the role of population size in genetic drift. - ✔️✔️Think of coin flip example 700
heads vs 300 tails is suspicious but 7 heads 3 tails is not. The smaller the number of
coin flips the more likely that chance alone will cause deviation from a predicted result.
Bottleneck effect - ✔️✔️Sudden change in environment, such as a fire or flood, may
drastically reduce population size. This sever drop in pop. Size causes the bottleneck
effect. By chance alone certain alleles may be overrepresented in the survivors and
others may be absent altogether or underrepresented.
Founder effect - ✔️✔️When a few individuals become isolated from a larger population,
this smaller group may establish a new population whose gene pool differs from the
source pop.
For ex. When few members from a pop. Are blown by a storm to an island.
Gene flow - ✔️✔️The transfer of alleles into or out of a population due to the movement of
fertile individuals or their gametes.
Describe how gene flow can act to reduce genetic differences between adjacent
populations. - ✔️✔️Example is the plant fly ex. Suppose there is two wildflower population
near each other and one consists primarily of white flowered, insects carrying pollen
from these plants may pollinate the original population and introduce the CW alleles and
modify the original allele frequencies for the next generation of wildflowers.
b/c alleles are exchanged b/w populations, it tends to reduce genetic differences b/w
populations. Can result in two populations combining into a single one.
Genetic Variation - ✔️✔️differences among individuals in the composition of their genes
or other DNA segments. It is the raw material that natural selection "works on"
Geographic variation - ✔️✔️differences in the genetic composition of separate
populations.
2
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller OliviaWest. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75632 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now