Question

Please help with this,

assess which evolutionary mechanisms is being simulated. Be as specific as possible. Your choices are: natural selection, sexual selection, genetic drift, founder effect, bottlenecking, gene flow.

In these scenarios, we will be using dry beans (red, white, and black—or substitute something similar) to simulate a population of sexual and asexually reproducing creatures with variation in phenotype

1) Take 10 red, 10 black, and 10 white beans and place them, mixed, on the table. These are asexually reproducing organisms. Record the starting phenotype # and frequencies (% of your total population) of your starting population in the table provided (generation 0) 2) Here, we are going to specify that the "red" phenotype is intermediate between the black and white phenotypes. Red beans are slightly more resistant to a deadly disease that regularly sweeps through the population. A disease hits your population, killing 20% of your black beans, 20% of your white beans, and 0% of your red beans. After this disease event, every surviving population member produces 1 clonal offspring Multiply your organisms accordingly. Calculate and record the phenotype # and frequencies (% of your total population) for generation 1 3) Repeat the disease event, allowing 20% of your white and black beans to die and 0% of your red beans to die. Allow the survivors to reproduce by I. Calculate and record the phenotype # and frequencies (% of your total population) for generation 2. 4) Repeat the disease event, allowing 20% of your white and black beans to die and 0% of your red beans to die. Allow the survivors to reproduce by I. Calculate and record the phenotype # and frequencies (% of your total population) for generation 3 Phenotvpe frequencies Gen 0 # | Gen 0 % | Gen 1 # | Gen 1 % | Gen 2 # 1 Gen 2 % | Gen 3 # | Gen 3 % re black white total Summarize how the final population looks different from the starting population. Which evolutionary mechanism is being simulated?

Answer 1

• Natural selection is acting in this population .
• In this population it is seen from this table , that as the generation proceeds , red population increases in the population .
• Black and white population decreases in its frequency.
• This type of selection is called as natural election.
• This is because nature selected the individuals that is most fit.
• The final population ie in generation 3 , it is seen that black and white population's frequency is less compared to starting generation.
• The population of Red is incraesed compared to starting population.

In the table

Gen 0

• Red = 2
• Black =5
• White =5
• When the disease kills 20% of population in black and white , the resulting population would be 2 red, 4 black and 4 white .
• Each black , white and red gives one offspring .
• so , the population of white 8, 8 black and 4 red respectively in generation 1.
• Similarly now in this generation 1, disease kills 20% f population
• So in generation 2, of total 8 in gen 1, 20% gets killed , so take only 6 survived in white and black and that gets doubled . No death in red.
• So 12 in black and white , 8 in red.
• Similar calculations for generation 3.