Bio lab 6 notes Dec 2 2009

23 views1 pages
Published on 24 Aug 2010
School
Department
Course
Bio lab 6
Phenotypies plasticity:
Phenotype t the out appearance t importanc ein the process of evolution
Evolution in population depends on phenotypic traits being passed down from generation to generation
t howver, is genotype the basic that cause the change
The genotype is the complete genetic constitution of an organism
When the phenotype is change in a population, it may results from the interaction between genotype
and the environment
Alternation of the phenotyoe in individual is called acclimation.
Note that it[s not a adapation, adaptation is the term used for population not for individual!
Phenotypic plasticity is the concept used by biologists to describe the degree to which a given genotype
can alter its phenotypoc expression in order to acclimate to irs surroundings
Reaction norm: the relationship between the environment and the trait in question
Cost and limits:
Who can[t all the traits be phenptypically plastic?
1st, insufficient genetic variation exists for the evolution of plasticity to occur.
Even if the genetic variation is sufficient, costs and limits may resultin a selective pressure against a trait
evolving phenotypic plasticity. Eg. Energy cost and stuff
Limitation:
To be accurate t if sense the environment wrong t may lead to death
Time consuming t take long time to change t the greater the change, the longer the time
Generalists and specialists:
Generalists: species with high phenotypic plasticity are commonly considered as ~
Specialists: are populations with low acclimation potential, but can maximally expolit a single set of
environmental conditions
Stable environment t specialists better
Heterogeneous environment t generalists better
Plastic response in plants t in plants, phytochrome accept the light, when receive different lights with
different wavelengths, it activate different set of genes and reponse differently
We use compound microscope here
www.notesolution.com
Unlock document

This preview shows half of the first page of the document.
Unlock all 1 pages and 3 million more documents.

Already have an account? Log in

Get OneClass Notes+

Unlimited access to class notes and textbook notes.

YearlyBest Value
75% OFF
$8 USD/m
Monthly
$30 USD/m
You will be charged $96 USD upfront and auto renewed at the end of each cycle. You may cancel anytime under Payment Settings. For more information, see our Terms and Privacy.
Payments are encrypted using 256-bit SSL. Powered by Stripe.