New combinations of linked genes are due to which of the following?
A) nondisjunction
B) crossing over
C) independent assortment
D) mixing of sperm and egg
E) both A and C
Ans: B) crossing over
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Meiosis consists of:
a. one round of chromosome duplication and one round of nuclear division. b. one round of chromosome duplication and two rounds of nuclear division. c. two rounds of chromosome duplication and two rounds of nuclear division. d. two rounds of chromosome duplication and one round of nuclear division.
The diastolic pressure for a normal young adult would be about:
a. below 60 mm Hg b. 80 mm Hg c. 100 mm Hg d. 120 mm Hg e. above 120 mm Hg
Which one of the following ecosystems is most likely to show an inverted biomass pyramid but a normal energy pyramid?
A. grassland B. open ocean C. intertidal D. tropical forest E. desert
Which of the following is the best measure of an organism's fitness?
a) its size, compared with other members of the same species b) the number of fertile offspring it produces c) how long it lives d) the number of mutations it acquires during its lifetime e) the amount of care it receives from its parents