Fossil evidence shows that giraffes living 1000 years ago had much shorter necks than the giraffes seen today. Which
statement best explains this observation?
a. The two groups of giraffes are not related.
b. The two groups of giraffes arose as a result of convergent evolution.
c. The difference in neck length is evidence for homoplastic inheritance.
d. The two groups of giraffes were located in different geographical locations.
e. The giraffes acquired longer necks through the continuing process of natural selection.
e
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When the replication machinery encounters a single-strand break, the replication fork collapses resulting in a double-strand break. Which of the following would be the fourth step in repairing this damage?
A. The 3' single-strand overhang invades the intact portion of the chromosome, pairs with its complementary strand, and displaces the other. B. Once the strand invasion is complete, branched migration occurs. C. The broken ends are processed, with the 5' ending strand selectively degraded to create 3' overhangs. D. Branch migration creates Holliday intermediates that are resolved by the enzyme resolvase. E. Resolution of the Holliday intermediate is followed by ligation and replication is restarted.
A _____ cell can divide into any cell type, whereas _____cells can divide into many but not all cell types.
Fill in the blank(s) with the appropriate word(s).
organs and organs systems complete most of their development during the:
What will be an ideal response?
organ system
What will be an ideal response?