What is different between two alleles of the same gene?
A) Their location. For example, one allele might be at the end of one chromosome, while the other allele is in the middle of another chromosome.
B) The chromosome number they are on. For example, one allele might be on chromosome 12, while the other one is on chromosome 3.
C) The information they carry. For example, one allele might carry the information for blue eye pigment, while the other carries the information for brown eye pigment.
D) The cell they are in. For example, one might be in a liver cell, while the other is in a blood cell.
C
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Which one of the following is the photosensitive protein that converts the energy of photons into electrical signals in the receptor cell?
A. opsin B. retinal C. chlorophyll D. organ of Corti
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). (a) Give the F1 and F2 phenotypic results of a cross of a pure-breeding rose comb (RR pp) with a pure-breeding pea comb (rr PP). (b) Give the phenotypic results of a cross of Rr Pp ? rr Pp. (c) Give the phenotypic results of a cross of RR Pp ? rr Pp. (d) Give the phenotypic results of a cross of Rr pp ? rr Pp. (e) Give the phenotypic results of a cross of Rr Pp ? rr pp. What will be an ideal response?
Scorpion pincers are enlarged:A
chelicerae. B. maxillae. C. mandibles. D. pedipalps. E. legs.
Bony fishes possess two features not found in other fish. Select the best choice from those listed below to complete the following sentence. Bony fishes have
A. swim bladders and movable jaws. B. swim bladders and a closed circulatory system. C. swim bladders and a complete digestive system. D. swim bladders and gill covers called opercula.