Transcript File

Population Changes
Darwin, genetics, & natural selection in action
Charles Darwin
He was a _____________ scientist.
Collected thousands of __________ and _________
samples along his boat journey on the Beagle
In the Galapagos, he found ___________ that looked
just like ones he’d seen in ______________ - a place
far away from their current location.
Similarities: Their _________ were suited to the way
they gathered _______.
Charles Darwin
He was a naturalist scientist.
Collected thousands of __________ and _________
samples along his boat journey on the Beagle
In the Galapagos, he found ___________ that looked
just like ones he’d seen in ______________ - a place
far away from their current location.
Similarities: Their _________ were suited to the way
they gathered _______.
Charles Darwin
He was a naturalist scientist.
Collected thousands of plant and animal samples along
his boat journey on the Beagle
In the Galapagos, he found ___________ that looked just
like ones he’d seen in ______________ - a place far away
from their current location.
Similarities: Their _________ were suited to the way they
gathered _______.
Charles Darwin
He was a naturalist scientist.
Collected thousands of plant and animal samples along
his boat journey on the Beagle
In the Galapagos, he found finches that looked just like
ones he’d seen in Ecuador - a place far away from their
current location.
Similarities: Their _________ were suited to the way they
gathered _______.
Charles Darwin
He was a naturalist scientist.
Collected thousands of plant and animal samples along
his boat journey on the Beagle
In the Galapagos, he found finches that looked just like
ones he’d seen in Ecuador - a place far away from their
current location.
Similarities: Their beaks were suited to the way they
gathered _______.
Charles Darwin
He was a naturalist scientist.
Collected thousands of plant and animal samples along
his boat journey on the Beagle
In the Galapagos, he found finches that looked just like
ones he’d seen in Ecuador - a place far away from their
current location.
Similarities: Their beaks were suited to the way they
gathered food.
What Darwin Thought
A _________ is a form of a genetically determined
characteristic.
_________________ _________________ is the human
practice of breeding animals or plants that have certain
desired traits.
Example: Certain traits of __________ and _________ were
bred into dogs needed for hunting as well as domestication.
Darwin realized: any ________ can produce many
_____________. However, _________________ of all species
are ____________ by starvation, disease, competition and
__________________.
What Darwin Thought
A trait is a form of a genetically determined characteristic.
_________________ _________________ is the human
practice of breeding animals or plants that have certain
desired traits.
Example: Certain traits of __________ and _________ were
bred into dogs needed for hunting as well as domestication.
Darwin realized: any ________ can produce many
_____________. However, _________________ of all species
are ____________ by starvation, disease, competition and
__________________.
What Darwin Thought
A trait is a form of a genetically determined characteristic.
Selective Breeding is the human practice of breeding animals
or plants that have certain desired traits.
Example: Certain traits of __________ and _________ were
bred into dogs needed for hunting as well as domestication.
Darwin realized: any ________ can produce many
_____________. However, _________________ of all species
are ____________ by starvation, disease, competition and
__________________.
What Darwin Thought
A trait is a form of a genetically determined characteristic.
Selective Breeding is the human practice of breeding animals
or plants that have certain desired traits.
Example: Certain traits of tracking and small size were bred
into dogs needed for hunting as well as domestication.
Darwin realized: any ________ can produce many
_____________. However, _________________ of all species
are ____________ by starvation, disease, competition and
__________________.
What Darwin Thought
A trait is a form of a genetically determined characteristic.
Selective Breeding is the human practice of breeding animals
or plants that have certain desired traits.
Example: Certain traits of tracking and small size were bred
into dogs needed for hunting as well as domestication.
Darwin realized: any species can produce many
_____________. However, _________________ of all species
are ____________ by starvation, disease, competition and
__________________.
What Darwin Thought
A trait is a form of a genetically determined characteristic.
Selective Breeding is the human practice of breeding animals
or plants that have certain desired traits.
Example: Certain traits of tracking and small size were bred
into dogs needed for hunting as well as domestication.
Darwin realized: any species can produce many offspring.
However, _________________ of all species are ____________
by starvation, disease, competition and __________________.
What Darwin Thought
A trait is a form of a genetically determined characteristic.
Selective Breeding is the human practice of breeding animals
or plants that have certain desired traits.
Example: Certain traits of tracking and small size were bred
into dogs needed for hunting as well as domestication.
Darwin realized: any species can produce many offspring.
However, populations of all species are ____________ by
starvation, disease, competition and __________________.
What Darwin Thought
A trait is a form of a genetically determined characteristic.
Selective Breeding is the human practice of breeding animals
or plants that have certain desired traits.
Example: Certain traits of tracking and small size were bred
into dogs needed for hunting as well as domestication.
Darwin realized: any species can produce many offspring.
However, populations of all species are limited by starvation,
disease, competition and predation.
Natural Selection
Second example of the four steps:
1) A tarantula’s egg sac may hold _______________ eggs.
Some will ____________ and some will not.
2) Each tarantula is ____________ but not identical to its
parents.
3) Some tarantulas may be caught by __________, such as
a wasp. Others may __________ or get disease. Only
some will survive until ______________.
Natural Selection
Second example of the four steps:
1) A tarantula’s egg sac may hold 500 – 1,000 eggs. Some
will survive and some will not.
2) Each tarantula is ____________ but not identical to its
parents.
3) Some tarantulas may be caught by __________, such as
a wasp. Others may __________ or get disease. Only
some will survive until ______________.
Natural Selection
Second example of the four steps:
1) A tarantula’s egg sac may hold 500 – 1,000 eggs. Some
will survive and some will not.
2) Each tarantula is similar but not identical to its parents.
3) Some tarantulas may be caught by __________, such as
a wasp. Others may __________ or get disease. Only
some will survive until ______________.
Natural Selection
Second example of the four steps:
1) A tarantula’s egg sac may hold 500 – 1,000 eggs. Some
will survive and some will not.
2) Each tarantula is similar but not identical to its parents.
3) Some tarantulas may be caught by predators, such as a
wasp. Others may starve or get disease. Only some will
survive until adulthood.
Natural Selection
Second example of the four steps:
1) A tarantula’s egg sac may hold 500 – 1,000 eggs. Some
will survive and some will not.
2) Each tarantula is similar but not identical to its parents.
3) Some tarantulas may be caught by predators, such as a
wasp. Others may starve or get disease. Only some will
survive until adulthood.
4) Successful reproduction means the tarantulas are best
adapted to their environment and will have many scary
spider babies.
Reading Check
How does variation in a species happen?
Many insects cannot live in cold environments because the
temperature of an insect’s environment is directly related to
its movement. But some bees have adapted to life in the
arctic. Which of the following adaptations did these bees
most likely develop in order to survive conditions in the
arctic?
A) An extra set of wings
B) A sharper stinger
C) Body hair
D) More aggressive behavior
Reading Check
How does variation in a species happen? This is due to the
exchange of genetic info as it is passed from parent to
offspring.
Many insects cannot live in cold environments because the
temperature of an insect’s environment is directly related to
its movement. But some bees have adapted to life in the
arctic. Which of the following adaptations did these bees
most likely develop in order to survive conditions in the
arctic?
A) An extra set of wings
B) A sharper stinger
C) Body hair
D) More aggressive behavior
Reading Check
How does variation in a species happen? This is due to the
exchange of genetic info as it is passed from parent to
offspring.
Many insects cannot live in cold environments because the
temperature of an insect’s environment is directly related to
its movement. But some bees have adapted to life in the
arctic. Which of the following adaptations did these bees
most likely develop in order to survive conditions in the
arctic?
A) An extra set of wings
B) A sharper stinger
C) Body hair
D) More aggressive behavior