ap biology saturday session 3 evolution as a process session 1 - microevolution
TRANSCRIPT
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AP BiologySaturday Session 3
Evolution as a ProcessSession 1 - Microevolution
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Question 1
CClue: it’s neck
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Question 2
BClue: evidence and
reasoning = true
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Question 3
DClue: resistance…to
survive over time
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Artificial Selection Backfiring
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Question 4
AClue: same
embryonic tissues
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Supporting EvidenceHomologous Structures
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Supporting EvidenceEmbryological Homologies
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Supporting EvidenceMolecular Homologies
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Analogous Structures
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Question 5
BClue: look essentially the
same = same environmental pressures
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Biogeography and Convergent Evolution
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Galapagos Islands close up(Adaptive Radiation)
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Darwin’s Galapagos Island finches
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Modes of Speciation
Allopatric speciation Sympatric speciation
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SpeciationPathways
Anagenesis Cladogenesis
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Question 6
CClue: change over time
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Evolutionary Flowflow = movement
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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
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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.)
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Genetic Drift –Bottleneck effect
Originalpopulation
Bottleneckingevent
Survivingpopulation
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“Founding fathers”
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“Founding fathers”
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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.)
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Variation in Crossover
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Variation in Anaphase I
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Variation in Anaphase II
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Variation in Egg and sperm(Which sperm will it be?)