selective breeding

We will begin class by watching a short
video on “A History Of Dogs”

While watching the video be thinking
about what you see, what makes you think,
and what makes you wonder.

https://www.youtube.com/watch?v=8_KWmzLObQ4

See
Think
Wonder

What do you see visually in
the video? What is the video
talking about?

What do you think the video is
trying to explain? What
thoughts come to mind after
watching this video?

What does this video make you
wonder about?

I can… Construct an explanation supported with
scientific evidence of the role of genes and chromosomes
in the process of inheriting a specific trait.
I can… Explain the benefits and problems of
selective breeding.

Learning Standard: S7L3. Obtain, evaluate, and communicate
information to explain how organisms reproduce either sexually or
asexually and transfer genetic information to determine the traits of
their offspring.

Selective Breeding: Definition

Selective = This
means choosing or
picking certain
things

Breeding = This

means mating

animals together to
produce offspring

Put it together! What do you
think the process of
selective breeding is?

Selective breeding- the
practice of mating individuals with
desired traits as a means of
increasing the frequency of those
traits in a population. (write this!!)

Selective Breeding: Video and Questions

Questions

2. What is the first stage of
selective breeding?

To produce animals and plants with
particular characteristics.

1.What is the purpose of
selective breeding?

Select two animals/plants with the desired
characteristics.

3. What are some problems with
selective breeding?

Selective breeding can lead to Inbreeding, which
increases the risk of diseases (as the gene pool is
reduced). E.g. breathing/respiratory problems in pugs.

Selective Breeding: Examples

Disease

resistance

in plant
crops

Large or
unusual

flowers that
will sell well

Animals such
as cows that
can produce
more meat

or milk

Domestic dogs

with gentle

natures - good

for pets

Can you think of any other examples of selective breeding?

Alan should breed Gilly and Bruce
together. Gilly produces the most milk of
the three cows & Bruce has a family
history of good milk production.

Alan should send Helga and Carl
to Tom. Helga and Carl both
have thick coats and can
withstand cold temperatures..

Alan should breed Betsy and Greg
together. Betsy has a good amount
of meat, while Greg is a champion
beef bull & has a lot of meat.

Now It’s Your Turn to Practice Selective Breeding

Selective breeding occurs when humans choose organisms to reproduce in the hopes that the
resulting offspring will inherit desirable traits. Dogs are an example of selective breeding.
Working and service dogs are often bred to perform specific jobs that benefit humans. In this
lab, you will choose a type of service dog to selectively breed for a specific function. How do
humans change or influence the inheritance of desired traits in organisms?

Choose which type of service dog
you would like to selectively breed.
Then, read the species profiles
to select two breeds that fit the
needs of your chosen service.

Selecting a Service

Below are four services that you can choose from to breed your service or working dog.
You can choose any of the services you would like. Before choosing the service you will
breed for, answer the pre-lab questions.

1. Which service or role are you most
interested in? Why?

2. How could breeding different types of
dogs help provide this service?

Tracking & Rescue

Herding & Guarding

Drafting & Carting
Medical & Support

Tracking and rescue dogs play an important role in searching for
people in need. These dogs may search the wilderness for lost
hikers or find people displaced after a natural disaster.

Herding and guarding dogs play an important role in managing
and protecting livestock. These dogs are reliable to many farmers
and ranchers.

Drafting and carting dogs have served an important role in
transporting and moving materials for a long time. These dogs love
to move carts!

Medical and support dogs help humans with disabilities and other
needs navigate the world. This could involve leading humans who
cannot see or alerting someone before a medical event occurs.

You will pick the type of service dog you want to breed.
Now you will go around the room and read the different
dog profiles. The profiles highlight different dog breeds
that can be selectively bred as service and working dogs.
You will complete the information table for five of the
breeds. Once you have chosen the two dogs you are
breeding put an X in the box. Now you will construct an
explanation of why those breeds are the best for the
desired service your dog will be doing.

What Am I Doing?

Exit Ticket

Once you are finished
bring me your
worksheet and I will
give you the exit ticket
of the day!