Two alleles of gene C control hair color in horses: C¹ and C². Horses homozygous for allele C¹ are red, heterozygotes are yellow, and C² homozygotes are cream. In the offspring of matings between heterozygotes, what phenotypic ratio is expected?
A) 2 yellow: 1 red
B) 3 red: 1 cream
C) 1 red: 2 yellow: 1 cream
D) all red
E) 9 red: 3 yellow: 4 cream
C) 1 red: 2 yellow: 1 cream
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The ability to smell ____
a. manifests as a 1:1 relationship between an odor and a specific receptor b. specific chemicals can indicate a possible reaction to a chemically related drug c. specific chemicals will predict the effectiveness of antidepressants d. is mediated by a family of about 400 genes e. is mediated by the synthesis of olfactory receptors in the brain
The external morphological traits of two North American species of tree frog (Hyla versicolor and H. chrysoscelis) are
very similar; therefore, scientists use ____ to distinguish them.
a. internal anatomy b. behavioral traits c. homologous appendages d. skin coloration e. analogous structures
Refer to Table 8.2. If the sequence of amino acids encoded by a strand of DNA is serine-alanine-lysine-leucine, the coding for the antisense strand of DNA is
A) 5' ACAGTTTCAAT. B) 5' TCTGCAAAGTTA. C) 3' UGUGCAAAGUUA. D) 3' UCUCGAAAGUUA. E) 3' TCACGUUUCAAU.
What would be strong evidence to suggest a protist is phagotrophic?
A. Silicon dioxide cell walls B. Benthic lifestyle C. An abundance of lysosomes D. Locomotion using polar flagella E. Presence of chloroplasts