Transcript Evolution: Environmental Factors

Evolution: Environmental
Factors
Environmental Factors
► Environmental
survival
factors impact parental
 This survival impacts the next generation
Types of Factors
► Fitness
(reproductive success)
► Recessive
lethal traits
 ss- Sickle cell anemia
► Heterozygous
advantage
 Ss-sickle cell resistant and malaria resistant
► Disease/Parasite
resistance
Type of Environmental Factors
► Changes
in habitat
 Drought
 Rainfall (flood)
►Land
animals
 Habitat loss
►Bison,
Grizzly
 Non-native species
Results of Environmental Factors
► Population
Reduction
 Decline in a population due to environmental or
artificial influence
►Disease/Catastrophe
►Humans
► Can
lead to extinction
 CA condors, Cheetahs, Grizzly Bears, Panda,
Florida Panthers
Benefits from Environmental Factors
► Camouflage
 A way of hiding by blending in with the
surrounding environment.
Benefits from Environmental Factors
► Mimicry
 the act of mimicking; imitative behavior
Smartboard Slides
► Humans
beings:
 Large gene pool, large genetic variation
► Cheetahs
 Small gene pool, small
genetic variation
► Large
genetic variation
more successful
 Less susceptible to
widespread pandemic
Smartboard Slides
► Trout
varieties
 Large gene pool
► Sharks
 Small gene pool, small
genetic variation
► Which
is more likely to
be affected by
widespread pandemic?
Smartboard Slides
► Rabbits
 Black rabbit separated from light colored rabbits
►Earthquake
rabbit
►What
caused a barrier between the species of
will eventually happen?
 Geographic isolation will cause the gene pools to be isolated
leading to two new species
Smartboard Slides
► Koi
Fish
 Orange colored fish
separated by Red-Black
fish
 Volcanic eruption
causes river to become
two lakes
 What will occur with the
species of Koi?
Smartboard Slides
► Prairie
Chicken/Ringnecked Pheasant
 Chicken
► Mating
dance that
attracts female
 Ring-necked Pheasant
► Genetically
compatible to
chicken (same gene pool,
etc.)
 Two species do not
interbreed………Why?
Smartboard Slides
► Frogs-Wood,
Leopard, Bull
 Wood frog mates- Spring
 Leopard frog mates- Winter
 Bull frog mates- Fall
► All
capable of breeding
 Will they?
 Why or why not….what type of
isolation is this?
Smartboard Slides
► Zebroid/Mule
 Produced by force
breeding from two
different species
 Creates sterile
offspring
 Are the horse, zebra,
and mule in the same
gene pool
► Are
they capable of
interbreeding?
Smartboard Slides
► Rainforest
 Similar species exist in the rainforest
►Capable
of interbreeding
 One lives in the canopy because of the need for
light
 The other lives near the floor
 Can they interbreed?
 What type of isolation is this?
Population Reduction
►
Bison-habitat destruction
►
Florida panther-habitat destruction
►
Grizzly Bear- habitat destruction/low food availability
►
Panda- habitat destruction/low food availability
►
CA Condor- habitat destruction
►
Bald Eagle- Poisoned, Poaching