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Bio Psyc

Learning Bio phyc

How does variation (new phenotypes) arise in a population through mutation. It is not arise through the need of a new trait as once thought.
Define the term species. The largest group of an organism in which two individuals can mate to produce fertile offspring
explain the term artificial selection when an organism with particular traits are deliberately selected from a population to produce certain traits in offspring.
What is a hybrid? Why are hybrids such as the liger not considered their own species. Offsprings of two different species that cannot produce offspring of their own.
Explain how artificial selection differs from natural selection. Artificial selection happens because of human intervention while natural selection happens naturally
Why is variation important for survival in a species? Variation ensures there are a variety of phenotypes in the population
Define the term fossil Preserved evidence in rocks or soils of an organism that once existed on earth
Why are some organisms more likely to be fossilised over others? must not be eaten by scavengers, must decay slowly, must be covered in sediment, tough exoskeleton.
Define the term homologous structure. Structure with the same basic characteristics but different structure.
Define the term analogous structure Structure with differing characteristics but same basic structure.
State whether fingerprints would be considered a homologous or analogous structure Analogous
How can the differences between the human and koala be explained different species
How can the similarities between different species be explained? They have the same basic purposes and have gained different traits over time.
Explain the term vestigial structure and provide some examples. Structures that organisms that have no apparent function and resemble structures found in other organisms
Explain how the distribution of fossils can be used for evidence of continental drift. The same fossils have been found in completely different locations.
List some of the skeletal changes that have occurred through evolution of various human-like species to modern day humans. Jaw, skull size, pelvis shape, toe/foot shape.
State the first step of natural selection Variation in the population already exists
state the second step of natural selection selection pressure is present in the environment
state the third step of natural selection individuals with favourable traits are more likely to survive, reproduce, and pass the trait onto their offspring
state the last step of natural selection over generations the number of individuals with favourable traits increases while the individuals with the unfavourable trait die out
state the first step of allopatric speciation Individuals get separated into two populations by a geographical barrier
state the second step of allopatric speciation mutations occur independently in the two populations
state the third step of allopatric speciation different selection pressure in the environment cause different phenotypes
state the last step of allopatric speciation When the two populations are brought together they can no longer produce fertile offspring
Created by: fergus.12