BIO 1500 Week 14 + 15
1. inbreeding: increased probability of offspring with homozygous recessive alleles, increases impact of recessive
genetic disorders
2. gene flow: a homogenizing force, meaning it makes different populations more alike ; movement of alleles from
one population to another ; allele frequencies become more similar
3. cline: interaction of gene flow can produce patterns of variation, generally associated with changes in habitats over
geographic space
4. two definitions of species: 1. taxonomic unit: goal is to recognize the product(pattern) of diversification
2. evolutionary unit: goal is the study of the processes that gernate biodiversity
5. species as a product: recognizes ancestry, descent, and heredity
6. phylogenetic species concept: species are irreducable clusters of individiuals with at least one
diagnostic characters ; species must be monophyletic
7. species as a process: since individuals cannot evolve, "populations" became the unit of evolution ; focused
on how evolution has caused diversity ; species defined as diversification process
1/3
, 8. biological species concept: Species is a group of populations whose members have the potential to
produce fertile offspring.
9. theory of process: species are definws by reproductive isolation and are therefore created by the develop-
ment of reproductive between formerly cohesive populations
10. reproductive isolation: isolated species can't interbreed, allowing these forms to evolve independently
; two levels of isolation are premating and postmating
11. premating isolation: prevents mating or fertilization
12. postmating isolation: prevents the development of fertile adults
13. types of premating isolation: temporal, ecological,l behaviorial, mechanical
14. temporal isolation: differing time of reproduction
15. ecological isolation: habitat differences
16. behavioral isolation: different visuals and auditoral cues
17. mechanical isolation: Morphological differences prevent fertilization (lock and key mechanism)
2/3
1. inbreeding: increased probability of offspring with homozygous recessive alleles, increases impact of recessive
genetic disorders
2. gene flow: a homogenizing force, meaning it makes different populations more alike ; movement of alleles from
one population to another ; allele frequencies become more similar
3. cline: interaction of gene flow can produce patterns of variation, generally associated with changes in habitats over
geographic space
4. two definitions of species: 1. taxonomic unit: goal is to recognize the product(pattern) of diversification
2. evolutionary unit: goal is the study of the processes that gernate biodiversity
5. species as a product: recognizes ancestry, descent, and heredity
6. phylogenetic species concept: species are irreducable clusters of individiuals with at least one
diagnostic characters ; species must be monophyletic
7. species as a process: since individuals cannot evolve, "populations" became the unit of evolution ; focused
on how evolution has caused diversity ; species defined as diversification process
1/3
, 8. biological species concept: Species is a group of populations whose members have the potential to
produce fertile offspring.
9. theory of process: species are definws by reproductive isolation and are therefore created by the develop-
ment of reproductive between formerly cohesive populations
10. reproductive isolation: isolated species can't interbreed, allowing these forms to evolve independently
; two levels of isolation are premating and postmating
11. premating isolation: prevents mating or fertilization
12. postmating isolation: prevents the development of fertile adults
13. types of premating isolation: temporal, ecological,l behaviorial, mechanical
14. temporal isolation: differing time of reproduction
15. ecological isolation: habitat differences
16. behavioral isolation: different visuals and auditoral cues
17. mechanical isolation: Morphological differences prevent fertilization (lock and key mechanism)
2/3
