Trait A is dominant to trait a, and trait B is dominant to trait b. If an AaBB mother mates with an AaBb father, what percentage of the offspring will have the aaBB genotype?
a. 12.5%
b. 18.75%
c. 25.0%
d. 50.0%
a. 12.5%
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Sexual reproduction and meiosis generate genetic variety by
A. random fertilization. B. All answers are correct. C. independent assortment. D. crossing over.
A rain shadow occurs in the dry lands on the sides of mountains facing the prevailing winds
____________________ Indicate whether the statement is true or false.
Hormone messages are received by
A. neurotransmitters. B. receptor molecules on target cells. C. dendrites. D. all body cells.