All Flashcards
What are the differences between homologous and analogous structures?
Homologous: Shared ancestry, similar structure, different function | Analogous: Different ancestry, different structure, similar function
What are the differences between Stratigraphy and Radiometric dating?
Stratigraphy: Relative dating, based on rock layers | Radiometric dating: Absolute dating, based on isotope decay
What are the basic steps involved in radiometric dating?
1: Measure the amount of parent isotope. 2: Measure the amount of daughter isotope. 3: Calculate the age based on the known decay rate.
What are the steps to determine relative age using stratigraphy?
1: Identify rock layers. 2: Determine the relative position of layers (deeper = older). 3: Compare fossil content within layers.
What is the effect of similarities in DNA sequences between two species?
Suggests a closer evolutionary relationship and common ancestry.
What is the effect of a structure becoming vestigial?
The structure loses its original function over evolutionary time.
What is the effect of mutations in DNA over long periods?
Can lead to the evolution of new traits and species.