Identify and briefly describe three biogeographical realms as described by Wallace. What will be an ideal response?


Nearctic and Palearctic realms: mainly North America (Nearctic) and Eurasia (Palearctic).
Contain plants and animals adapted to cold climates.
Neotropical realm: Central and South America; opossum, armadillo and porcupine are
unique to this realm.
Ethopian realm: most of Africa; contains the most varied vertebrates of all realms.
Oriental realm: parts of India and Southeast Asia; contains the fewest endemic species of all
the tropical realms
Australian realm: Australia and New Guinea; no native placental mammals, but marsupials
and monotremes predominate.

Biology & Microbiology

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Prokaryotic cells lack

a. DNA. b. a true nucleus. c. a cell wall. d. none of the above.

Biology & Microbiology

An x-shaped appearance of chromosomes during the process of meiosis provides evidence of

a. irradiation damage. b. crossing over. c. chromosomal aberration. d. fertilization. e. spindle fiber formation.

Biology & Microbiology

Phenotypic characteristics that have a continuous distribution are considered to be ________ traits

Fill in the blank(s) with correct word

Biology & Microbiology

If you cross two pea plants, one with green peas and the other with yellow peas, you find all of the offspring have yellow peas. You conclude Select one:

a. yellow is incompletely dominant over green. b. yellow is dominant over green. c. green is dominant over yellow. d. yellow and green are co-dominant. e. color is random in pea plants.

Biology & Microbiology