In poultry, the genes for rose comb (R) and pea comb (P) produce walnut whenever they occur together (R__ P__); single-combed individuals have the homozygous condition for both genes (rr pp). Give the phenotypic results of a cross of Rr Pp x rr Pp
A. 9/16 walnut, 3/16 rose, 3–16 pea, 1/16 single
B. 3/8 walnut, 3/8 pea, 1/8 rose, 1/8 single
C. 3/4 walnut, 1/4 rose
D. 1/4 walnut, 1/4 rose, 1/4 pea, 1/4 single
E. 1/4 walnut, 1/4 rose, 1/4 pea, 1/4 single
Answer: B
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Unlike bryophytes and seedless vascular plants, gymnosperm sporophytes do not disperse their spores
1.True 2.False
An incompletely dominant gene controls the color of
chickens so that BB produces black, Bb produces a slate-gray color called blue, and bb produces splashed white. A second gene controls comb shape, with the dominant gene R producing a rose comb and r producing a single comb. If a pure-breeding, black chicken with a rose comb is mated to a splashedwhite chicken with a single comb in the F2 generation, what fraction of the offspring will be blue with rose comb? a. 9/16 b. 3/8 c. 3/16 d. 1/8 e. 1/16
During gastrulation, the cellular process by which ectoderm in the animal pole spreads toward the vegetal pole is called
A. epiboly. B. invagination. C. involution. D. convergent extension. E. apical constriction.
The role of DNA ligase is to
a. join together fragments of DNA. b. replace mispaired bases. c. initiate DNA replication. d. form new DNA polymers. e. break apart hydrogen bonds.