Which phenotypic effects does crowding have on the migratory locust? How are these changes adaptive?
What will be an ideal response?
ANSWER: Migratory locusts can develop into either solitary or migratory forms. Crowding induces a
transformation to the migratory form with more body fat and longer wings. These changes
are adaptive because dispersal reduces competition in the original environment and may
establish new populations in unoccupied environments.
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What types and subtypes of photoreceptors are present in the retina?
What will be an ideal response?
Using fetal DNA from the mother's blood for prenatal testing is a noninvasive procedure
a. True b. False Indicate whether the statement is true or false
What is the function of the iris?
a. control the amount of light entering the eye b. focus the image on the retina c. respond to particular colors d. keep the lens under tension to allow for image focusing e. prevent light scattering upon entry to the eye
Which of the following is a common ailment characterized by a burning sensation caused by gastric juices backing up into the esophagus?
A) acidosis B) gastritic stress C) porosis D) heartburn