Genetics Practice Test Worksheets Page 9
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3425. The table below indicates a reproductive
26. In the summer, the arctic fox appears brown
pattern in some sea turtles when eggs
because its cells produce a dark pigment.
develop in areas with di ering temperatures.
However, in the winter, the arctic fox appears
white because the dark pigment is not
Sex Determination in Sea Turtles
produced. The color change is most likely
due to the e ect of
Temperature ( C)
O spring Produced
below 23
usually none
(1) di erent genes produced in the di erent
23–27
mostly males
seasons
28–30
50/50 males: females
31–33
mostly females
(2) increased pollution on genetic mutations
above 33
usually none
(3) environmental conditions on gene
expression
The sex of turtle o spring is most probably
(4) poor nutrition on cell growth and
development
(1) determined only by genes inherited from
the parent turtles
(2) controlled entirely by the location where
the young are raised
(3) a result of genetic information being
in uenced by environmental conditions
(4) an identical pattern to the reproductive
27.
Even though identical twins have the same
pattern found in humans
genetic material, they may develop slightly
di erent characteristics because
(1) each twin receives di erent chromosomes
from the egg
(2) one twin may only have genes from the
father
(3) gene expression may be in uenced by
factors that switch genes on and o
(4) a gene mutation may have occurred
before the zygote divided
page 9
GENETICS UNIT PRACTICE TEST
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