In the formula for determining a population's genotype frequencies, the "pq" in the term 2pq is necessary because _____
A) the population is diploid
B) heterozygotes can come about in two ways
C) the population is doubling in number
D) heterozygotes have two alleles
D
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Water exits the sponge spongocoel through the:
a. choanocytes. b. spicules. c. ostia. d. osculum. e. pinocytes
When blood returns from the pulmonary circuit, it first enters which chamber of the heart?
a. left atrium b. left ventricle c. right atrium d. right ventricle e. both the left atrium and the right atrium
Cytoplasmic division in animal cells involves
all EXCEPT a. formation of a cell plate. b. a contractile ring mechanism. c. a deepening cleavage furrow. d. a ring of actin filaments under the plasma membrane at the equator. e. ATP.
All of the following are true about the members of the Kingdom Animalia except
A) They are multicellular. B) They have eukaryotic cells. C) They can photosynthesize. D) They use organic carbon sources. E) They ingest their food