Many male songbirds are brightly colored. However, the color of the birds is determined by a balance of
A. natural selection against bright colors by predation and sexual selection in favor of bright colors.
B. gene flow that reduces bright colors and natural selection in favor of bright colors.
C. mutations that reduce bright colors and sexual selection in favor of bright colors.
D. mutations that reduce bright colors and gene flow in favor of bright colors.
E. natural selection against bright colors by predation and mutations that introduce bright colors.
A. natural selection against bright colors by predation and sexual selection in favor of bright colors.
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Humans with mutations in the gene encoding AQP1 (aquaporin-1) that cause the absence of AQP1are
characterized by an inability to ____.
a. concentrate urine despite prolonged thirsting d. control sweating b. control edema e. salivate c. make large volumes of dilute urine
The chytrid Batrachochytrium dendrobatidis is responsible for a disease that
a. is sexually transmitted in humans. b. has wiped out many species of frogs. c. infects wheat, rye, and other grain crops. d. is killing trees in temperate forests. e. kills millions of humans each year.
The eye structure that changes shape in order to focus an image on the retina is the __________.
A) Cone
B) Fovea
C) Lens
D) Retina
For the following gene, you notice the following results. Mutant # Deletion Region % Transcription (lungs) % Transcription (kidneys) WT None 100% 100% 1 1-200 150% 150% 2 250-400 100% 100% 3 500-800 50% 50% 4 950-
1100 0% 100% What type of sequence has been mutated in mutant 4?