The most accurate description of an organism with genotype AaBb is
a. homozygous dominant.
b. heterozygous.
c. heterozygous dominant.
d. homozygous recessive.
e. heterozygous recessive.
B
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The goldenrod gall fly lays its eggs on the terminal buds of goldenrod plants
Larvae chew through the buds and into the stems, where their saliva induces the plant to generate a gall, or outgrowth of tissue that then provides food and shelter for the developing larva. The larvae are prey to both parasitoid wasps and to birds; wasps selectively prey on larvae inside the smallest galls while birds selectively prey on larvae inside the largest galls. Goldenrod gall flies are therefore subject to A. balancing selection. B. stabilizing selection. C. directional selection. D. disruptional selection. E. heterozygote advantage.
Which of the following takes generations to occur?
A. An irritability response B. Metabolism C. Evolution D. Adaptation
Determine whether the following statement is true or false: Master regulators such as Ey in Drosophila are so powerful that they can even activate their regulatory networks outside the normal location.
a. true b. false
Mycetismus is caused by
A. ingestion of food contaminated with fungus. B. ingestion of toxic mushrooms. C. ingestion of milk from a cow that has ingested feed contaminated with fungal toxins. D. inhalation of fungal allergens. E. contamination of a wound with pathogenic fungi present in the skin.