Which of the following is a single-gene trait?
a. brown hair
b. blue eyes
c. height
d. the widow's peak hairline
e. All of the above are single-gene traits.
Ans: d. the widow's peak hairline
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The human axial skeleton includes
_____ the sternum. _____ the vertebral column. _____ the humerus and tibia. _____ the femur. _____ the pelvis.
With __________, an animal learns to associate an involuntary response to one stimulus with another
stimulus. Fill in the blank(s) with the appropriate word(s).
Which one of the following helps make ecosystems more stable?
A. biodiversity B. bacteria C. stable amounts of sunlight D. rainfall
Answer the following questions true (T) or false (F)
1. Reverse transcriptase synthesizes a DNA molecule from an RNA template. 2. The goals of recombinant DNA technology include production of new organisms with useful combinations of traits. 3. Restriction enzymes are useful only on synthetic DNAs.