Ch.24 - Evolution of PopulationsWorksheetSee all chapters
All Chapters
Ch.1 - Introduction to Biology
Ch.2 - Chemistry
Ch.3 - Water
Ch.4 - Carbon
Ch.5 - Biological Molecules
Ch.6 - Cells
Ch.7 - The Membrane
Ch.8 - Energy and Metabolism
Ch.9 - Respiration
Ch.10 - Photosynthesis
Ch.11 - Cell Signaling
Ch.12 - Cell Division
Ch.13 - Meiosis
Ch.14 - Mendelian Genetics
Ch.15 - Chromosomal Theory of Inheritance
Ch.16 - DNA Synthesis
Ch.17 - Gene Expression
Ch.18 - Regulation of Expression
Ch.19 - Viruses
Ch.20 - Biotechnology
Ch.21 - Genomics
Ch.22 - Development
Ch.23 - Evolution by Natural Selection
Ch.24 - Evolution of Populations
Ch.25 - Speciation
Ch.26 - History of Life on Earth
Ch.27 - Phylogeny
Ch.28 - Prokaryotes
Ch.29 - Protists
Ch.30 - Plants
Ch.31 - Fungi
Ch.32 - Overview of Animals
Ch.33 - Invertebrates
Ch.34 - Vertebrates
Ch.35 - Plant Anatomy
Ch.36 - Vascular Plant Transport
Ch.37 - Soil
Ch.38 - Plant Reproduction
Ch.39 - Plant Sensation and Response
Ch.40 - Animal Form and Function
Ch.41 - Digestive System
Ch.42 - Circulatory System
Ch.43 - Immune System
Ch.44 - Osmoregulation and Excretion
Ch.45 - Endocrine System
Ch.46 - Animal Reproduction
Ch.47 - Nervous System
Ch.48 - Sensory Systems
Ch.49 - Muscle Systems
Ch.50 - Ecology
Ch.51 - Animal Behavior
Ch.52 - Population Ecology
Ch.53 - Community Ecology
Ch.54 - Ecosystems
Ch.55 - Conservation Biology

Solution: A population ecologist observes that the surface area of leaves in a species of dandelion growing in a desert is much smaller compared to the larger surface area of leaves of the same species growing

Problem

A population ecologist observes that the surface area of leaves in a species of dandelion growing in a desert is much smaller compared to the larger surface area of leaves of the same species growing in areas that receive greater rainfall. She gathers seeds from individual plants growing at both low and high rainfall locations, plants them in a uniform environment in a greenhouse, and measures the leaf area of the new plants. All of her experimentally grown plants grow to have similar leaf surface areas. From this she concludes that _____.

a. leaf surface area is not an adaptive trait that promotes fitness

b. the variation she originally observed was due to genetic differences

c. the variation she originally observed was due to disruptive selection

d. the variation she originally observed was an example of non-genetic environmental influence

e. stabilizing selection was responsible for leaf-area differences in the parent plants