Four genes (A, B, C, D) are in the same chromosome in the sequence D, A, B, C. The distance between A and B is 4 map units, between A and C is 6 map units, between B and C is 2 map units, and between B and D is 5 map units
The recombination frequency between
genes C and D should be
A. 2%
B. 4%
C. 5%
D. 6%
E. 7%
E
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There is genetic evidence of interbreeding
between Homo neanderthalensis and H. sapiens about ___ years ago but not after ___ years ago.
a. 6000---4000 b. 60,000---40,000 c. 600,000---400,000 d. 600---400 e. there is no genetic evidence of interbreeding between these two species
The first bacterium that was clearly identified as the cause of an infectious disease was:a
Legionella pneumophila, which causes Legionnaires' disease. b. Chlamydia sp., which causes pelvic inflammatory disease in women. c. Clostridium botulinum, which causes botulism. d. Vibrio cholerae, which causes cholera. e. Bacillus anthracis, which causes anthrax.
What are the two proteases in the small intestine that complete protein digestion?
a. aminopeptidase and dipeptidase b. aminopeptidase and disaccharidase c. nucleotidase and nucleosidase d. dipeptidase and phosphatase
Some ecologists have proposed that gaps created by disturbances lead to habitat heterogeneity, which, in turn, leads to the coexistence of greater numbers of tree species in tropical habitats, as compared to temperate habitats. Which of the following hypotheses is most closely associated with this proposal?
A) Red Queen hypothesis D) intermediate disturbance hypothesis B) character displacement hypothesis E) energy-diversity hypothesis C) Hamilton-Zuk hypothesis