Macroevolution | Study Cards

Evolution at a larger scale across many populations Deals with the origin of new species & lineges over a long period of time

The process for creating new species

It’s what used to define a species

1) Morphological SP 2) Biological SP

Characterizes a species based on body shape & structural features

May not help to distinguish 2 closely related species that are very similar & may not represent 1 or more species

When members of a different population can mate & produce fertile offspring in a natural enviorment

Not applicabale to asexual species & extinct species

Prevents reproduction attempts & makes it unlikely fertiliozation will be successful

1) Ecological Isolation 2) Temporal Isolation 3) Behavioral Isolation 4) Mechanical Isolation 5) Gamete Isolation

Species that occur in the same area, but occupy different habitats & rarely interact w/ each other

Species living in the same area, but mate at different times of the day or year

When signals of ano species are not recognized by another

Different physical structures make mating impossible

When individuals of different species mate, but fertilization does not happen b/c of incompatability between the sperm and the egg

Prevents hybrid offspring from developing/breeding

1) Hybrid Inviablility 2) Hybrid Sterility 3) Hybrid Breakdown

Fusion of gametes, but fail to develop

Hyrbids are sterile

When the second generation of hyrbids reduce survival or fertility

1) Allopatric SP 2) Symatric Sp 3) Adaptive Sp

One initial population is divided by a physical barrier and Natural Selection takes place on both sides creating two new species

A population develops into 2 or more reproductiviliy isolated groups w/out geographic isolation

When many species evolve from a single common ancestor after they are exposed to different enviroments & resoures