The __________ is responsible for the separation of the chromosomes during __________ of mitosis
a. cell wall; anaphase
b. flagellum; metaphase
c. mitotic spindle; anaphase
d. kinetochore; prophase
e. centromere; telophase
C
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Sympatric speciation differs from allopatric speciation because in sympatric speciation
A. a population becomes geographically isolated. B. two populations of the same species merge to form a single population. C. polyploidy must first arise. D. hybrid zones form. E. there are no physcial barriers against interbreeding.
The ____ forms the skeleton of invertebrate chordates
a. pharynx b. neural crest c. oral hood d. notochord e. cranium
The greatest amount of nutrient absorption
takes place in the a. stomach. b. small intestine. c. colon. d. pancreas. e. esophagus.
Many of the color varieties of summer squash are determined by several interacting loci: AA or Aa gives white, aaBB or aaBb gives yellow, and aabb produces green. Assume that two fully heterozygous plants are crossed. Give the phenotypes (with
frequencies) of the offspring. A) 12 white : 3 yellow : 1 green B) 3 white : 9 yellow : 4 green C) 4 white :9 yellow : 3 green D) 12 white : 1 yellow : 3 green E) 9 white : 3 yellow : 4 green