Evolution and Natural Selection Flashcards
1
Q
Why do species become extinct
A
Environment change
New predator
New disease
Can’t compete with new species for food
Catastrophic event
2
Q
What is speciation
A
When phenotype of an organism changes so much that it becomes a new species
3
Q
What is a phenotypes
A
The observable characteristics in an individual resulting from the expression of genes
4
Q
Jean Baptisme Lamark 1744-1829
A
Changes an organism aquires in its lifetime are passed on to its offspring. Acquired characteristics
5
Q
When does speciation occur
A
when populations of a species become so different that they can no longer succesfully interbreed to produce fertile offspring
6
Q
Alfred Russel Wallace
A
Worked on ideas of speciation and natural selection in 1850s
