Share Units 7-8 Review
Save to Folder
Which scientist supported the hypothesis that acquired traits (like ability to play the trumpet) could be passed to offspring?
Jean Baptiste Lamarck
Two organisms have similar traits because they live in similar environments, not because they have a recent common ancestor. What type of evolution is this?
convergent
Two organisms have similar underlying structures because they share a recent common ancestor. What type of evolution is this?
divergent evolution
Divergent evolution leads to organisms having ___ structures.
homologous
Convergent evolution leads to organisms having ____ structures.
analagous
The change in frequency of an existing gene variant in the population from one generation to another due to random chance; effects more severe in small populations.
genetic drift
A species population becomes separated by a geographic barrier, whereby reproductive isolation evolves producing two separate species.
allopatric speciation
The movement of genes into or out of a population.
gene flow
The loss of genetic variation that occurs when a new population is established by a very small number of individuals from a larger population.
founder effect
A sharp reduction in the size of a population due to environmental events such as famines, earthquakes, floods, fires, disease, and droughts.
bottleneck effect
A gene has two alleles, B = brown, b = white. The frequency of white-haired goats is 25%. What is the frequency of the b allele?
0.5
A gene has two alleles, B = brown, b = white. The frequency of white-haired goats is 25%. What is the frequency of heterozygous individuals?
0.5
Name two pieces of evidence of evolution.
fossils, H-W calculations, comparing DNA/protein sequences, direct observation, homologous/analogous/vestigial structures
Structures that have no apparent function and appear to be residual parts from a past ancestor.
vestigial structures
Identify & describe the outgroup.
lamprey; most differences compared to the rest; distantly related to the rest of the organisms
List three biotic factors that affect a boa constrictor's survival and reproduction in the rainforest.
Food/competition/predators
