The sex of the fruit fly Drosophila melanogaster is determined as follows: XX chromosomes give a female and XY give a male. The gene for bar eyes is recessive and located on the X chromosome. If two bar-eyed flies are mated, what percentage of the offspring will have bar eyes?
A. none
B. 25%
C. 50%
D. 100%
D. 100%
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Amphibians are completely dependent on an
aquatic environment for
a. respiration. b. feeding. c. reproduction. d. respiration and reproduction. e. respiration, reproduction, and feeding
The butterfly-shaped center of the spinal cord (the gray matter) is made up of
a. dendrites. b. neuronal cell bodies. c. interneurons. d. neuroglial cells. e. all of these.
If a dihybrid cross is begun with a P1 generation of a plant that produces smooth and yellow peas,
crossed with a plant that produces wrinkled green peas, the F2 plants will have either smooth yellow peas or wrinkled green peas. Indicate whether the statement is true or false.
Evaluate this statement: Cholesterol is a type of lipid, and thus all cholesterol lipids are bad for human health
A) True, because high levels of cholesterol lead to increased heart disease. B) True, because high levels of cholesterol lead to obesity. C) False, because some types cholesterol increase heart disease, but other types are necessary, especially in the plasma membrane. D) False, because cholesterol levels are not related to human health.