A gene created from the fusion of two gene fragments is considered a
A. tumor-suppressor gene.
B. proto-oncogene.
C. structural gene.
D. regulatory gene.
E. chimeric gene.
E. chimeric gene.
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Three-spined stickleback fish (Gasterosteus aculeatus) show substantial heritable variation in gill-raker length related to differences in their diets. Longer gill rakers appear to function better for capturing open-water prey,
while shorter gill rakers function better for capturing shallow-water prey. Which of the following types of selection is most likely to be found in a large lake (open water in the middle and shallow water around the sides) with a high density of these fish? A) directional selection B) stabilizing selection C) disruptive selection D) sexual selection
HIV adversely affects
A. red blood cells. B. nerve cells. C. macrophages. D. T helper cells. E. macrophages AND T helper cells.
The genetic code is made up of units consisting
of how many nucleotides? a. 2 b. 3 c. 5 d. 6 e. 9
The net reproductive rate is the sum of what column?
A) lxbx B) bx C) lx D) x