Fraternal twins (dizygotic) result from the fertilization of
A. two eggs and two sperm.
B. two eggs and one sperm.
C. one egg and two sperm.
D. one egg and one sperm.
E. two eggs and one sperm OR one egg and two sperm.
A. two eggs and two sperm.
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If there are 20 chromatids in a cell, how many centromeres are there?
A) 10 B) 20 C) 30 D) 40 E) 80
How would you best explain the existence of a mountain range that has abundant conifer trees, ferns, and mosses on the east side, but only sparse shrubby plants on the west side?
A. Differences in solar intensity produce the differing plant communities. B. Adiabatic cooling leads to temperature gradients that produce the differing plant communities. C. Differences in the specific heat of the two sides of the mountain produce the differing plant communities. D. Precipitation differences due to a rain shadow on the west side produce the differing plant communities.
When only one nucleotide base is involved in a mutation, this is called
A. chromosomal mutation. B. template error. C. point mutation. D. nonsense codon.
Which of the following is believed to have given rise to eukaryotes?
A. Ectosymbiosis B. Endosymbiosis C. Episymbiosis D. Ectendosymbiosis