What process does NOT produce variation?
a. crossing over
b. random alignment of chromosomes during meiosis
c. mitosis
d. genetic recombination of alleles
e. sexual reproduction
ANSWER: c
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A male inherits his X-linked allele from his mother.
Answer the following statement true (T) or false (F)
As an erythroblast develops into an erythrocyte, it
A) becomes filled with clotting proteins. B) begins to manufacture platelets. C) loses its ability to reproduce. D) takes on the characteristics of an immature monocyte. E) undergoes active aerobic metabolism.
The heath hen, found off the east coast of North America in the eighteenth century, is now extinct. What finally caused its extinction?
A) overexploitation B) pollution C) natural disasters D) habitat loss
Where are the food materials digested by fungi located?
A) externally B) within their mitochondria C) within food vacuoles D) within their cells