Cells that do not divide are usually arrested in
a. S.
b. G1.
c. G2.
d. M.
e. prophase.
Answer: b. G1.
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In a human karyotype, chromosomes are arranged in 23 pairs. If we choose one of these pairs, such as pair 14, which of the following do the two chromosomes of the pair have in common?
A) length and position of the centromere only B) length, centromere position, and staining pattern only C) length, centromere position, staining pattern, and traits coded for by their genes D) They have nothing in common except that they are X-shaped.
Which of the following statements concerning cancer and mutations is correct?
A. Cancer can only occur with a mutation in a somatic cell. B. Cancer can only occur with a mutation in a germ cell. C. Usually multiple mutations are required in different genes to cause cancer. D. Usually a single mutation is all that is required to cause cancer. E. None of the answer options is correct.
Which genes encode proteins that regulate the cell cycle in normal cells?
a. tumor suppressor genes b. proto-oncogenes c. oncogenes d. tumor suppressor genes and proto-oncogenes e. tumor suppressor genes, proto-oncogenes, and oncogenes
Non-disjunction occurs during meiosis I in a human so that only chromosome #3 is affected. The rest of meiosis proceeds normally. For the 4 gametes formed from this round of meiosis, which of following is a correct description of their chromosome number?
a) 2 gametes will have 23 chromosomes and 2 gametes will have 24 b) 2 gametes will have 22 chromosomes and 2 gametes will have 24 c) all of the gametes will have 22 chromosomesd) all of the gametes will have 24 chromosomes d) all of the gametes will have 24 chromosomes