Males of many marsupial species have forked penises that are incompatible with the anatomy of female placental mammals. What type of isolating mechanism does this represent?
A. hybrid sterility
B. mechanical incompatibility
C. temporal isolation
D. prevention of gamete fusion
E. ecological isolation
Answer: B
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During a particular period of physiological crisis, imagine that your carbon dioxide levels increase sharply, and consequently your blood pH decreases. Predict what will happen to the affinity of your hemoglobin for oxygen in this situation.
A. The affinity for oxygen by hemoglobin is constant- it does not change. B. The affinity for oxygen by hemoglobin will increase. C. The affinity for oxygen by hemoglobin will decrease.
The current mass extinction is said to be 100 to 1000 times above the background extinction rate
What does this mean? What will be an ideal response?
Which blood type is the universal donor?
a. A+ b. B c. AB+ d. AB e. O
Dominant traits are expressed only in the heterozygous state. Indicate whether the statement is true or false