AP BiologySaturday Session 3

Evolution as a ProcessSession 1 - Microevolution

Question 1

CClue: it’s neck

Question 2

BClue: evidence and

reasoning = true

Question 3

DClue: resistance…to

survive over time

Artificial Selection Backfiring

Question 4

AClue: same

embryonic tissues

Supporting EvidenceHomologous Structures

Supporting EvidenceEmbryological Homologies

Supporting EvidenceMolecular Homologies

Analogous Structures

Question 5

BClue: look essentially the

same = same environmental pressures

Biogeography and Convergent Evolution

Galapagos Islands close up(Adaptive Radiation)

Darwin’s Galapagos Island finches

Modes of Speciation

Allopatric speciation Sympatric speciation

SpeciationPathways

Anagenesis Cladogenesis

Question 6

CClue: change over time

Evolutionary Flowflow = movement

Math Question Solution

• The correct answer is: 0.0002• Solution – 100,000 is total population• Affected (p2 or 2pq) = 34 individuals• Unaffected = 100,000 – 34 = 99,966

individuals• q2 = 99,966 or 0.99966 (99966/100,000)• q = √.99966 = 0.99983• p = 1 – q = 1.0 - 0.99983 = 0.00017 = 0.0002

Short Free Response 14 points possible

Possible points awarded for:Discussion of Bottleneck effect being a natural disaster affecting a populations genetic composition and survivors being the ones the escaped via the bottle neck. (1 pt.)Discussion of a logic natural disastrous event affecting a population. (1 pt.)Discussion of Founder Effect a population being separated or leaving from a larger population and altering genotype frequency (1 pt.)Discussion of a logical separation event (1 pt.)

Genetic Drift –Bottleneck effect

Originalpopulation

Bottleneckingevent

Survivingpopulation

“Founding fathers”

“Founding fathers”

Short Free Response 23 points possible

Possible Points awarded for:Discussion of crossover in Meiosis leading to variation from the parents genome. (1pt.)Discussion of segregation during Anaphase 1 and 2 leading to various gametic outcomes OR various gametes by independent assortment. (1pt.)Discussion of random fertilization increasing variety by combining two genomes. (1 pt.)

Variation in Crossover

Variation in Anaphase I

Variation in Anaphase II

Variation in Egg and sperm(Which sperm will it be?)