Natural Selection
What is the difference between an allele and a gene
A gene is a DNA segment coding for a specific trait. An allele is one variant of that gene
What is convergent evolution?
a similar trait developing from independent evolutionary lineages
For billions of years, life was only in what part of the earth?
The Oceans
How do snails eat?
A rasping radula
what is a coelom?
An internal intestinal canal
what is Allelopatric speciation?
speciation caused by geographic separation
What is evolutionary reversal
The reverting to a trait previously seen in the lineage of a species
What is a eukaryote?
organisms with cells that have membrane bound organelles
Why is horshoe crab blood blue?
It is copper based
Where on humans do we see the human lineage going back to the ocean?
Gill slits in embryos
what are the tree criteria needed for natural selection to take place?
Why can evolution not occur without a reproductive barrier?
The genes will continue to mix and two separate lines will not emerge
Why did plants need to evolve waxy cuticles to move onto land?
Do avoid drying out
What is it called when an animal offers a food or a token (or their lives) to a potential mate?
A nuptial gift
milk secreted from skin
descendants of the first birds to make it to an island will share many of the genetic traits of those original individuals. What is this called.
The founder effect
What is stabilizing selection
Selection for a specific trait that is so strong that variation for that trait decreases
Why did respiration not evolve until after the evolution of phtosynthesis?
There was virtually no oxygen in the atmosphere for respiration
What is the Cambrian explosion?
a period of very rapid adaptive radiation
What is the main characteristics that separates crocodilians from dinosaurs
They are spraying
If males with longer tails tend to be more successful in finding mates, females might be selecting them because their offspring will likely also have long tails and be more successful at finding mates. What is this theory called?
The Sexy Sons hypothesis
What is the term for the rapid diversification of evolutionary lines after something like a mass extinction
Adaptive radiation
All animals that evolved after amphibians are referred to as what?
Amnotes
The is the "Great American Exchange"
When the land bridge developed between North and South America
Why are there no marsupials in Europe?
They evolved in southern Gondwana