BIO 121 Exam 1 Review Questions With All Correct Answers.
5 views 0 purchase
Course
Bio 121
Institution
Bio 121
Natural Selection - Answer A theory in which individuals with certain traits produce more offspring than others without these traits.
Evolution - Answer The gradual change in a species over time.
Adaptation - Answer When the heritable trait increases an individuals fitness in a parti...
BIO 121 Exam 1 Review Questions With
All Correct Answers.
Natural Selection - Answer A theory in which individuals with certain traits produce more offspring
than others without these traits.
Evolution - Answer The gradual change in a species over time.
Adaptation - Answer When the heritable trait increases an individuals fitness in a particular
environment.
Ancestral trait - Answer Is a character that existed in an ancestor.
Derived trait - Answer Is one that is a modified form of the ancestral trait, found in a descendants.
Vestigial trait - Answer A reduced or incompletely developed structure that has no (or reduced)
function (e.g. human tailbone or wisdom teeth).
Homologous structures - Answer Are similarities that exist in species descended from a common
ancestor (e.g. humans, dogs, and birds have similar limb structure).
Convergent evolution - Answer Occurs when similar environmental pressures and natural selection give
rise to similar (analogous) structures in distantly related organisms.
Dispersal - Answer The movement of organisms or individuals from one place to another can result in
Allopatric Speciation (e.g. birds flying to a new island).
Vicariance - Answer The physical splitting of a habitat, some type of geographic barrier can result in
Allopatric Speciation. (e.g. rivers or mountains splitting populations).
Microevolution - Answer Explores changes in populations over time. (Evolution on a small scale)
, Macroevolution - Answer Explores how new species evolve over time. (Evolution on a small scale)
Dominant Allele - Answer An allele whose trait always shows up in the organism when the allele is
present. (Y)
Recessive Allele - Answer An allele that is masked when a dominant allele is present. (y)
Homozygous recessive genotype - Answer yy
Homozygous dominant genotype - Answer YY
Heterozygous genotype - Answer Yy
Phenotype - Answer An organism's physical appearance, or visible traits.
Genetic drift - Answer Is any change in allele frequencies in a population due to chance.
Population bottleneck - Answer Is a drastic reduction in population size brought about by a natural
catastrophe or over-hunting (e.g. elephant seals in the 1800s).
Founder Effect - Answer Occurs when a small number of individuals individuals leave a large population
and establish a new isolated population.
Phylogenetic tree - Answer A graphical summary of evolutionary history of organisms. Shows
evolutionary relationships among genes, species and higher taxa.
Systematics - Answer The field of science that organizes organisms into phylogenetic trees.
Taxonomy - Answer The classification of organisms.
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 TestSolver9. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.99. You're not tied to anything after your purchase.
