Polar bodies are unique products of ________
A) cytokinesis B) spermatogenesis C) mitosis D) oogenesis
Answer: D
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Following their respective breeding seasons, several species of hummingbirds occur at the same locations in North America and several hummingbird flowers bloom simultaneously in these habitats. These flowers seem to have converged to a common morphology and color. Birds are most visually sensitive to the color red. Hummingbird flowers are pollinated by hummingbirds. Which of the following features of these flowers would indicate they have coevolved with hummingbirds? (Check all that apply)
A. flowers produce a high volume of nectar and sugar B. flowers are low to the ground C. long tubular flowers D. blooming time of the flowers coincides with the arrival of the hummingbirds E. flowers are colored violet and blue
The early branching angiosperms have ______ diversity than later branching groups
A. more B. less C. the same
In a pedigree chart, a female who does not demonstrate the trait being studied is represented by a
a. darkened square. b. clear diamond. c. clear circle. d. darkened triangle. e. darkened oval.
Scientists have inserted a gene from the bacterium Bacillus thuringiensis into corn plants in order to:
A) directly increase the growth rate of the corn. B) increase the corn's resistance to insects. C) decrease the plant's toxicity. D) increase the plant's tolerance to solar radiation. E) decrease the toxicity of Bacillus thuringiensis.