Evolution, 4th Edition

SPECiES And SPECiATion 239 birds also vary in color, and they mate assortatively: red birds tend to mate with red birds, and blu ...

240 CHAPTER 9 season: their life cycle is timed to match the difference between fruit development of the two plants. Some of the ...

SPECiES And SPECiATion 241 By contrast, perhaps as many as one-third of the endemic species of plants on Lord Howe Island may ha ...

242 CHAPTER 9 of mating behavior showed that partial sexual isolation has evolved in at least one of these species [34]. The lev ...

■■Several definitions of “species” have been pro- posed. Most evolutionary biologists use the bio- logical species concept, whic ...

reciprocal translocation reinforcement reproductive isolating barrier (RIB) reproductive isolation secondary contact segregation ...

UNIT III Products of Evolution: What Natural Selection Has Wrought 10_EVOL4E_CH10.indd 245 3/22/17 2:25 PM ...

10_EVOL4E_CH10.indd 246 3/22/17 2:25 PM ...

Many of nature’s greatest wonders are about sex. It is impossible not to be astonished by the mating display of a male peacock. ...

248 CHAPTER 10 Even bacteria and viruses have sex of a sort. Although they lack the form of sex based on meiosis that is familia ...

All AbouT SEx 249 What Are Females and Males? In plants, animals, and some other eukaryotes, the gametes of a species come in tw ...

250 CHAPTER 10 fishes that live deep in the world’s oceans [39]. A female anglerfish attracts her prey with a bioluminescent lur ...

All AbouT SEx 251 Sexual Selection It is easy to understand how some traits have evolved to become sexually dimorphic. An indivi ...

252 CHAPTER 10 length. The clipped feathers were glued onto the tails of males in the second group, increasing their tail length ...

All AbouT SEx 253 total lifetime fitness. That optimal value of the trait shifts if the strength of natu- ral or sexual selectio ...

254 CHAPTER 10 The outcome of sexual selection is strongly influenced by the operational sex ratio, which is the relative number ...

All AbouT SEx 255 injuries, for example blindness in an eye, from fighting. But the payoffs are big for the winners. While nearl ...

256 CHAPTER 10 female, there are opportunities for other males to prevent his sperm from fertil- izing her. The penis of Calopte ...

All AbouT SEx 257 Sexual selection by female choice Many extravagant male secondary sexual traits are useless for male-male comp ...

258 CHAPTER 10 nothing but make sexual displays (FIGURE 10.14). Their complex courtship display shows off the males’ elaborate p ...