Crossing over is ________.
A. an independent assortment of chromosomes
B. the exchange of corresponding portions of homologous chromosomes.
C. the formation of tetrads
D. the movement of genetic material from one chromosome to a nonhomologous chromosome
B. the exchange of corresponding portions of homologous chromosomes.
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A comparative morphologist would be most likely to study ________
a. theological writings about the origins of life b. the worldwide distribution of cactus-like plants c. the distribution of earthquakes and volcanoes d. differences and similarities in the structures of organisms
Diploid cells have two copies of each chromosome
1.True 2.False
One strategy that allows larger cells to have an effective surface area to volume ratio is:
a. having a completely spherical shape. b. being short and fat. c. having thin, finger-like projections. d. having a thinner plasma membrane. e. locomotion
The urochordates are
a. Called tunicates b. Marine animals c. Sessile as adults, but tadpole-like as larvae d. Often abundant in intertidal zones e. All choices are correct