BIO 265 Exam 2 UH Manoa Justin Walguarney. Exam Questions and Answers 100% Pass
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Module
BIO 265
Institution
BIO 265
BIO 265 Exam 2 UH Manoa Justin
Walguarney. Exam Questions and Answers
100% Pass
What is the Definition of Population? - answerA group of individuals of a single species living
in the same general Area.-Have same resources -Influenced by same enviromental factors -
Likely to interact and breed ...
BIO 265 Exam 2 UH Manoa Justin
Walguarney. Exam Questions and Answers
100% Pass
What is the Definition of Population? - answer✔A group of individuals of a single species living
in the same general Area.-Have same resources -Influenced by same enviromental factors -
Likely to interact and breed with one another.
What is Population Genetics? - answer✔Uses math and empirical studies to understand allele
frequency distributions and changes, including those that lead to adaptation and speciation
What is Population Ecology? - answer✔Study of populations in relation to their environment.
What are the 4 environmental influences? - answer✔1)Density 2)Distribution 3)Age structure
4)Dynamics (changes in size)
What is a closed population? - answer✔Where membership is stable. Changes in Population only
happen through Birth or Death.
What is an open population? - answer✔Where membership (# in pop) can change. This can be
due to immigration and emigration as well as Birth and death.
What is Population Density? - answer✔Result of an interplay between process that add
individuals to a population and those that remove individuals (Births and Immigration add
whereas Deaths and Emigration remove)
What are some simple cast assumptions for annual plants and insects? - answer✔1)Rate of
reproduction of an individual remains constant.2)Individuals only breed once, generations do not
overlap.
Another Simple Case assumption? - answer✔The rate at which a population increases is a simple
multiple of the number of individuals already present in the populations.Ex: Gen 1: 10 Individ
Gen 2: 10 X 2 Indiviud Gen 3: 10 X 4 indivud
What is the Exponential Population equation? - answer✔N(t)=R^t * N(i)
Ex: What is the population size if we start with 1000 individuals with net replacement rate per
generation of 2 and watch them increase for 5 generations?N(5)= 2^5 x 1000 = 32,000
What is the rate of increase if it increases in size by 50% in one generation? - answer✔R= 1.5
A population was observed to increase from 5000 to 6000 individuals in one year, What is the
rate of increase? - answer✔Rate of increase = 6000/5000
How to figure out rate of increase? - answer✔Population Final/Population Initial
What is the exponential growth equation for continuous breeding? - answer✔dN/dt= B-D = (b-
d)N =rNr= b-d ( INTRINSIC RATE OF INCREASE)B= instantaneous birth rate(B=b *N)
(b=avg birth rate)D= instantaneous death rate. (D=d*N) (d= avg death rate)
What is r? - answer✔Intrinsic Rate of increase Also gives the slope of the line dN/dT
What does it mean when r=0? - answer✔No change in numbers over time.dN/dt= 0
What if r is less than 0 (Negative? - answer✔Population will decline over timedN/dt is negative
What if r is positive? - answer✔Population will increase over time.dN/dt is positive
What is the integral form for exponential growth? - answer✔N(t)= N(0) * e^rt
N(0)=Initial Population N(t)= Population at t e= 2.71828 r is intrinsic rate of increase
Difference between the differential form and integral form of population growth? -
answer✔Differential form (dN/dt=rN) finds the CHANGE in population size.Integral form
(Nt=N0*e^rt) finds the actual new population size.
Important thing to remember about exponential growth. - answer✔If it is positive, it will increase
exponentially and forever. HOWEVER, no organism can increase indefinitely, so the logistic
model has a limit modification to the equation.As size/growth exponentially increases, it will
decrease growth in population.
How do you figure the stable population size occur? (Hint: Equation) - answer✔N=(b0
d0)/(kb+kd)
When Birth Rate-Death rate/ Sum of carrying capacty THIS IS ALSO THE CARRYING
CAPACITY (Max Sustainable Pop Size)
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