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 = 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
Chapter 24 The 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