Ch. 23 Warm-Up Use the following information to help you answer the question below: Population = 1000 people AA = 160 Aa = 480 aa = 360 1. What are the genotypic frequencies? Allele frequencies? 2. Use directional, stabilizing or disruptive selection to answer the following: a) The mice in the Arizona desert have either dark or light fur. b) Birds produce 4-5 eggs per clutch c) Average human baby weighs 7 lbs. d) Darwin's finches and beak size during drought
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Ch. 23 Warm-Up Use the following information to help you answer the question below: Population = 1000 people AA = 160Aa = 480aa = 360 1.What are the genotypic.
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Ch. 23 Warm-UpUse the following information to help you answer the
question below:Population = 1000 peopleAA = 160 Aa = 480 aa = 360
1. What are the genotypic frequencies? Allele frequencies?
2. Use directional, stabilizing or disruptive selection to answer the following:a) The mice in the Arizona desert have either
dark or light fur.b) Birds produce 4-5 eggs per clutchc) Average human baby weighs 7 lbs.d) Darwin's finches and beak size during drought
Chapter 24The Origin of Species
What You Need to Know:• The difference between microevolution and
macroevolution.• The biological concept of a species.• Prezygotic and postzygotic barriers that
maintain reproductive isolation in natural populaitons.
• How allopatric and sympatric speciation are similar and different.
• How autopolyploid or an allopolyploid chromosomal change can lead to sympatric speciation.
• How punctuated equilibrium and gradualism describe two different tempos of speciation.
Speciation = origin of species
•Microevolution: changes within a single gene pool
•Macroevolution: evolutionary change above the species level▫cumulative effects of speciation over long
periods of time
HHMI Video Clip: Reproductive Isolation and SpeciationRunning Time: 2:38 min
•Species = population or group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring▫Reproductively compatible
•Reproductive isolation = barriers that prevent members of 2 species from producing viable, fertile hybrids