Genetics Practice Test Worksheets Page 25
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3469. Modern dogs are direct descendants of the
70. Scientists have cloned sheep but have not yet
gray wolf. They rst appeared about 130,000
cloned a human. The best explanation for
years ago. Today, there are about 150
this situation is that
di erent breeds of domestic dog, a few of
which are shown below.
(1) the technology to clone humans has not
been explored
(2) human reproduction is very di erent
from that of other mammals
(3) there are many ethical problems involved
in cloning humans
(4) cloning humans would take too long
All modern domestic dogs are descendants of the gray wolf.
adapted from:
The great variety of modern dogs can best
be explained by
(1) selective breeding of dogs over many
71.
Scientists have successfully cloned animals,
years
including large mammals such as sheep.
(2) the cloning of domestic dogs
Which statement provides the most likely
reason that a human has not yet been cloned?
(3) genetic alterations in gray wolves alive
today
(1) Humans have DNA that is structurally
(4) natural selection favoring wolves over
very di erent from other mammals.
dogs
(2) Cloning can only be performed on
animals that normally reproduce
asexually.
(3) Human genes are made of too many
di erent types of simple sugars.
(4) Some people consider human genetic
experiments unethical.
page 25
GENETICS UNIT PRACTICE TEST
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