- Based on Darwin's observations, it was concluded that an unequal ability of individuals to survive and reproduce leads to...
- The Superb Bird of Paradise has a complex and elaborate mating ritual. This ritual prevents the birds from mating with a partner who will not produce fertile, viable offspring with you. This is an example of what type of reproductive barrier?
- When Arizona's Grand Canyon formed, squirrels and small mammals that had once been part of a single population could no longer contact and reproduce with each other across this new geographic barrier. They could no longer interbreed. Today, two separate squirrel species inhabit the north and south rims of the canyon. What type of speciation is this an example of?
- Microevolution is a change in allelic frequency over a long period of time
- Corsican red deer inhabit, among other places, two islands called Corsica and Sardinia. Through molecular analysis, scientists were able to determine that the population of Corsican red deer on the islands of Corsica and the population of Corsican red deer on the islands Sardinia are highly genetically related to one another. Scientist hypothesis that the island of Corsica was populated with small group of red deer from the Sardinian island.
- Macroevolution is evolution on a ___A___ and occurs over ___B___, while microevolution is evolution on a ____C____ and occurs over ____D_____. Lastly macroevolution results in ____E____ while microevolution acts on a ____F____.
- The black mamba is a venomous snake. The males of this species are often observed engaged in wrestling matches where they attempt to pin each other's head repeatedly to the ground. The winner of the match gains mating rights to receptive females. What type of behaviour are these snakes displaying?
- Red parrots are brought on an expedition to a remote section of jungle with only blue parrots, introducing color variation into the gene pool of jungle parrots.
- Several different species of marine animals release large amounts of sperm and egg into the surrounding seawater at the same time. The gametes then release species specific chemical attractants or pheromones to attract a gamete of their same species. As a result, gametes from different species are not attracted to one another. What type of reproductive barrier is this an example of?
- The fossil records that show that the size of the black bears in Europe decreased to an average of 70kg during interglacial periods of the ice ages. Prior to the interglacial period they weigh an average of 240kg. (outcome of natural selection with population described)
- The rapid evolution of mammals after the extinction of the dinosaurs.
- You discover a new species of mammal where the young are highly dependent on the mother, but not the father. The males also have adaptations for fighting for mates. This leads you to conclude that these birds establish ___________ mating relationships.
- As larva, salamanders have feathery gills outside of their body. As they transform into adults, the gills are lost in most species of salamander. However, on species axlotis retains this juvenile feature (external gills) as adults.
- Early feathers in birds first evolved to minimize heat loss. They were then used as part of mating rituals. Gradually over time, they evolved to be used for a different purpose: flight.
- Pin Oak Trees grow to be an average of 25 meters tall. Shorter oak trees do not get exposed to enough light to survive. Taller oak trees are more easily blown over by the wind. As a result, most oak trees grow within a small range. (outcome of natural selection with population described)
- Hamilton proposed moving the nation's capital from New York City to a new site on the Potomac primarily to
- All of the alleles of all of the genes within a population are defined as a
- In the 1890's hunting reduced the Northern elephant seals population size to as few as 20 individuals by the end of the 19th century. Their population has since rebounded to over 30,000 -- but they have much less genetic variation than a population of southern elephant seals that was not so intensely hunted.
- Who was president when the United States acquired and began to explore the Louisiana Territory?
- A population of beetles moves into a new environment with patches of light-green moss and dark-green shrubs. Both the light and dark beetles are better hidden than medium-green beetles. (outcome of natural selection with population described)