The master gene for male sex determination is located on _____
a. both X chromosomes
b. each autosome
c. the Y chromosome
d. the X chromosome
e. both X and Y chromosomes
ANSWER: c
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Which of the following descriptions illustrates phenotype variation caused by environment?
A) inheritance of body builder "physique" B) diet of caterpillars changes their morphology C) variation in horse coat color D) average beak depth during drought
A bird cracks open the seed coat with his teeth before swallowing
Indicate whether the statement is true or false.
A simple reflex consists of the effects of a stimulus on a ______that causes transmission of a message through parts of the _____ system and leads to an _____ response by an effector.
Fill in the blank(s) with the appropriate word(s).
Blue-footed boobies have webbed feet and are comically clumsy when they walk on land. Evolutionary scientists view these feet as
A) an example of a trait that is poorly adapted.
B) the outcome of a trade-off: Webbed feet perform poorly on land but are very helpful in diving for food.
C) an example of a trait that has not evolved.
D) a curiosity that has little to teach us regarding evolution.