Chapter 12: Genetic Engineering

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11 Δεκ 2012 (πριν από 4 χρόνια και 11 μήνες)

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Chapter 12: Genetic Engineering

Section 1: Modifying the Living World

Breeding Strategies



Farmers and ranchers throughout the world have long tried to
_______________________ organisms with which they work



By selecting the _________________________________
________ plants or
animals to produce the next generation, people have found that the productivity
of a domesticated species can gradually be _________________________

o

Results from using breeding strategies such as _____________________

___________________
____




Inbreeding and hybridization

Selective Breeding



The oldest and most obvious way of improving a species is by
__________________________________________
, or selecting a few
individuals to serve as parents for the next generation



______________________
_______________ of California (1849


1926) was
perhaps the world’s foremost selective breeder

o

Produced more than 250 new varieties of _________________

Inbreeding



Once a breeder has successfully produced an organism with a ______________

_________________
________________________________, the next concern is
to ________________________________________ of similar organisms

o

________________________________



Crossing individuals with similar characteristics so that those
characteristics will appear in their off
spring



__________________

o

____________________________________

Hybridization



One of the most useful of the breeder’s techniques is
____________________________

o

A cross between ___________________________ individuals



Often involves crossing members of diffe
rent but related species



_________________________________

Mutations: Producing New Kinds of Organisms



Selective breeding is confined to characteristics that _______________________
in a population



However, __________________________ are inheritable change
s in DNA so
they can sometimes produce organisms with new characteristics

o

If these are ________________________, breeders can use selective
breeding to produce an ______________________________________
possessing these characteristics



A breeder may not wan
t to wait for a beneficial mutation to ________________

___________________________




A breeder may decide to _____________________________ increase the
chances of mutation occurring in a group of organisms

o

_________________________



Include ________________
________________________



Cause _________________________



Particularly useful with _______________________