CHAPTER 1 THE BUILDING BLOCKS OF RELATIONSHIPS
Human beings are a very social species.
People suffer when they are deprived of close contact with others, and at the core of our social nature is
our need for intimate relationships.
Natural Selection in Snail Chirality
Hoso et al. (2010) analyzes the effects of snake predation on the chirality of snail taxa. There are
two clear pieces of evidence to demonstrate that natural selection has occurred in the evolution o
1. The graph below shows the distribution of copulation success, measured as the number of mates in a
breeding season, for a wild population of black-tailed prairie dogs, Cynomys ludovicianus.
a) Which sex (male or femal
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Geographys Impact on Trinidadian Guppies
Geography and selection bring about important effects that make strong impacts on gene
flow in populations. Crispo et al.s paper on Trinidadian Guppies discusses selection, inc
Selection Pressure on Lactase
Wooding (2007) summarizes the studies done by Tishkoff et al. (2007) which prove that lactase
persistence has been a trait that has evolved by natural selection. Natural selection is an evolutionary
At the conclusion of Chapter 1, students should be able to:
1. Describe the nature of intimate relationships and identify the six ways they typically differ
from relationships that are more casual.
2. Discuss the need to bel