Natural Selection
Showshoe hares can be grey or white. A snowshoe hare population has shifted over time. A larger amount of the hares are grey than previously as snow in the area has melted. This is the selection pressure that caused the shift.
What are predators?
This is how a non-heritable trait will cause a population to change over time
What is it will not?
Bats, horses, and humans having similar bone structures in their limbs are an example of this
What are homologous structures?
This type of isolation happens due to organisms being physically unable to do the act of reproduction
What is mechanical isolation?
These are five letter words that start with the 1^(2^3^4^5) letter of the alphabet
What is apple, axles, aspic, asked, artsy?
A species of parrot can have green beaks or black beaks. Neither beak color gives an advantage to the parrots when it comes to surviving or reproducing. This is how beak color in the population of parrots will change over time.
What is it will not change?
A population that is growing exponentially does not have any of these
What are limiting factors?
Human tail bones, whale hip bones, and claws on bird wings are an example of these
What are vestigial structures?
One species splitting into two different species due to a change that causes part of the population to reproduce in the spring and the other part to reproduce in the summer is due to this type of isolation
What is temporal isolation?
He is the symbol on the periodic table for this element
What is helium?
A species of lions has a recessive gene that causes some lions to be 1.5x the size of other lions. These lions are more capable at finding food and mates. These lions are also sterile. This is how the amount of these lions in the population will change over time.
What is it will not?
When a population has a limiting factor, we see this type of growth on a population graph
What is logistic/logarithmic?
More of this in DNA evidence is evidence that organisms have less recent common ancestor
What are differences in the DNA sequence?
Speciation due to a different in mating songs in a bird population would be a result of this type of isolation
What is behavioral isolation?
This is the color that you get when you mix white and red
What is pink?
A species of seal has a common genetic mutation that causes them to retain heat better than other seals. As such, these seals do not have to spend as much energy keeping themselves warm. More of these seals survive to reproductive age when there is limited fish for the population to eat. This is how the population will change over time.
What is there will be more seals with this mutation?
These are different biotic limiting factors
What are disease, predators, prey?
Similar morphology in most mammal embryos at the start of their development is an indicator that all mammals have this far back in their evolutionary history
What is a common ancestor?
Speciation due to parts of a population being physically separated is this type of speciation
What is allopatric speciation?
What is a Tapir?
A snowshoe hare population has shifted to be larger over time as more plants can grow in their habitat as it gets warmer. Larger hares are more successful at finding mates than smaller hares. This is the selection pressure that caused this shift.
What is availability of mates?
These are different abiotic limiting factors
What are climate, geography, water?
Branches on a cladogram show that organisms have these in common
What are a common ancestor and a derived characteristic?
Speciation when organisms live in the same are but don't reproduce with each other is this type of speciation
What is sympatric speciation?
This cell part is responsible for packaging proteins into vesicles
What are the golgi bodies?