Question

EXPERIMENT 3: STOCHASTIC EVENTS

21. What observations can you make regarding the gene pool and gene frequency of the founding individuals?

22. Do these results vary between beakers #1 and #2? Why or why not?

23. What observations can you make about the genetic variation between the parent and founding populations? How does the source of the founding population (Beaker 1 or Beaker 2) influence these results?

24. How will future generations from Beaker 3 differ from those of their parent populations?

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https://esciencelabs.com/sites/default/files/V3/Biology/2nd_Edition_Introductory_Biology/Docs/IB_1108_L15_Population/IB_1108_L15_Exp3_StochasticEvents.pdf

Answer 1

Answer:

Experiment:3

• We remove beads from the beakers to simulate the hurricane.

$\rightarrow$Beaker 1: 3 red beads, 7 blue beads

$\rightarrow$Beaker 2: 5 green beads, 0 yellow beads

$\rightarrow$Beaker 3: 2 green beads, 0 yellow beads

• This is the founding population flown out by the hurricane.

$\rightarrow$Ratio of red:blue:green:yellow is 3:7:7:0.

21):

• In experiment 2, the ratio (frequency) and gene pool has remained somewhat consistent.
• In experiment 3, the ratio has changed drastically with one genotype completely absent and hence change in gene pool.

22):

• In experiment 2 the ratio has changed to 10:15:11:4.
• However this depends on the fitness of the genotype. If for example, yellow butterflies have very low fitness, none may survive the fire.
• In experiment 3 the ratio has changed to 3:7:7:0.

23):

• The parent population ratio is 21:29:13:7
• The founding population is 3:7:7:0.
• The yellow bead (butterfly) genotype has been completely wiped out.
• This is the founder effect where the new population no longer represents the parent population in terms of both gene pool and gene frequency.
• The founder effect typically results in loss of genetic variation.

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