Which statement describes human sperm or egg cells?
A) They are produced by the process of mitosis.
B) They have one copy of each chromosome.
C) They have two copies of each chromosome.
D) They are genetically identical to all gametes made by a person.
B
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The correct sequence of steps in the M phase of the cell cycle is _________________
A. prophase, prometaphase, metaphase, anaphase, telophase, nuclear division B. prophase, prometaphase, metaphase, anaphase, telophase, cytokinesis C. prophase, metaphase, prometaphase, anaphase, nuclear division, telophase D. prophase, metaphase, anaphase, telophase, cytokinesis, nuclear division
According to the multiregional model,
a. Homo erectus populations migrated out of Africa. b. Homo erectus evolved further in regions beyond Africa. c. Homo erectus populations gave rise to races of Homo sapiens. d. Homo sapiens subpopulations originated in several separate locations. e. all of these are true.
Refer to the accompanying figure. What label designates the auricles on this organism?
a. 1
b. 2
c. 3
d. 4
e. 5
Which of the following happens when a new island arises from the ocean and life begins to colonize the island?
A) coevolution B) primary succession C) secondary succession D) competitive exclusion