Ch.24 The Origin Of Species

Front 1

two species of frogs are mated in the lab and produced viable but sterile offspring

Back 1

reduced hybrid fertility, postzygotic

Front 2

two species of sea urchins release gametes at the same time, but no cross fertilization occurs

Back 2

gametes isolation, prezygotic

Front 3

two orchid species eith different length nectar tubes are pollinated by different moths

Back 3

mechanical isolation, prezygotic

Front 4

two species of mayflies emerge during different weeks in spring

Back 4

temporal isolation, prezygotic

Front 5

two species of salamanders will mate and produce offspring, but their offspring are sterile

Back 5

hybrid breakdown, postzygotic

Front 6

two similar species of birds have different mating rituals

Back 6

behavioral isolation, prezygotic

Front 7

embryos of two species of mice bred in the lab usually abort

Back 7

reduced hybrid viability, postzygotic

Front 8

peepers breed in woodland ponds, leopard frogs breed in swamps

Back 8

habitat isolation, prezygotic

Front 9

biological

Back 9

reproductive isolation

Front 10

morphology

Back 10

atomical differences, most commonly used

Front 11

ecological

Back 11

unique roles in specific environments

Front 12

pluralistic

Back 12

both reproductive isolation and ecological niche

Front 13

genealogical

Back 13

unique genetic history gives each species a set of unique genetic markers

Front 14

allopatric speciation

Back 14

when two populations are geologically separated

Front 15

sympatric speciation

Back 15

biological barriers prevent gene flow between overlapping populations

Front 16

autopolyploid

Back 16

has more than two sets of chromosomes that have all come from the same species

Front 17

punctuated

Back 17

small burst of change, no pattern

Front 18

allometric growth

Back 18

the differing rates of growth of various parts of the body, leads to the final shape of the organism

Front 19

paedomorphosis

Back 19

is the retention in the adult of juvenile traits of ancestral organisms due to genetic changes of speeds

Front 20

heterochrony

Back 20

the evolutionary change in the rate or timing of development

Front 21

exaptation

Back 21

structures that evolved and functioned in one setting and were then Co-opted for a new function

Front 22

species selection

Back 22

the species that last the longest and speciate the most often will determine the direction of evolutionary trends

Front 23

cladogenesis

Back 23

most biological diversity

Front 24

anagenesis

Back 24

nonbranching evolution