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

Biology & Microbiology

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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.

Biology & Microbiology

The greatest amount of nutrient absorption

takes place in the a. stomach. b. small intestine. c. colon. d. pancreas. e. esophagus.

Biology & Microbiology

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

Biology & Microbiology

The ____ forms the skeleton of invertebrate chordates

a. pharynx b. neural crest c. oral hood d. notochord e. cranium

Biology & Microbiology