Mrs. Keadle JH Science
Name__________________________________ period _____
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Artificial Selection
1. Complete the chart:
Artificial Selection
Advantages
Disadvantages
2. What is the main difference between natural selection and artificial selection?
3. Can selective breeding go too far? _________________
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Selective Breeding
Mrs. Keadle JH Science
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Most domesticated animals have
been bred for specific, favorable
traits. Dairy cows are bred for
maximum milk production while
dogs are bred for size and color,
among other characteristics.
The process of humans
controlling the breeding of
organisms is known as A
natural selection
B
artificial selection
C
manipulative reproduction
D
sheltered breeding
When humans first domesticated
dogs, there was relatively little
diversity in the species. Today,
there are many variations such
as the German shepherd and the
dalmation. This increase in
diversity is most closely
associated with -
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Which of the following is NOT an
advantage of selective breeding?
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F
maintains certain stable
traits to pass down to the
offspring
G
traits help the animal
prosper in confinement
H
breeding for only one trait
can cause problems in other
traits
J
makes the species stronger
Cattle have been kept by
humans for many years. Which
of these characteristics in cattle
is most likely to have occurred
because ranchers used selective
breeding?
F
cattle that eat grass
A
cloning of selected body cells
G
cattle that have parasites
B
selective breeding
H
cattle that produce no horns
C
mitotic cell division
J
cattle that are crossed with
buffalo
D
environmental influences
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Selective Breeding
Mrs. Keadle JH Science
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Drawings from hundreds of years ago show horses that are much smaller than
horses today. Which of the following is the best explanation for the increased
size of horses
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A
Horses have been genetically engineered
B
Selective breeding has made horses larger
C
Genetic therapies have been used to make horses larger
D
certain sex-linked genes have been lost
Corn is a very useful grass that comes in many varieties. Sweet corn is used for
human food whereas field corn is for livestock. Corn also comes in many colors
like white, yellow and blue. Most farmers grow tall varieties of corn, while a
backyard gardener may prefer a smaller, dwarf variety. All of the following are
characteristics of corn that has been selectively bred except F
the amount of sugar in corn seed
G
the colors of corn used in tortillas
H
the size of corn plants grown by gardeners
J
the edibility by livestock
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Selective Breeding