Red pigmentation in the head and throat

Assignment Help Biology

Reference no: EM1395421

In the wild, male house finches (Carpodus mexicanus) vary considerably in the amount of red pigmentation in their head and throat feathers, with colors ranging from pale yellow to bright red. These colors come from carotenoid pigments that are found in the birds' diets; no vertebrates are known to synthesize carotenoid pigments. Thus, the brighter red the male's feathers are, the more successful he has been at acquiring the red carotenoid pigment by his food-gathering efforts (all other factors being equal). During breeding season, one should expect female house finches to prefer to mate with males with the brightest red feathers. Which of the following is true of this situation?
a. Alleles that promote more efficient acquisition of carotenoid-containing foods by males should increase over the course of generations.
b. Alleles that promote more effective deposition of carotenoid pigments in the feathers of males should increase over the course of generations.
c. There should be directional selection for bright red feathers in males.
d. Three of the statements are correct.
e) Two of the statements are correct.

Reference no: EM1395421

Questions Cloud

Range of mechanical properties for bone : Bones vary in mechanical properties. Where on the range of mechanical properties for bone do you think this bone would fall? Address at least elastic modulus, yield stress, and yield or ultimate strain.

Who is the responsible staff member : Who is the responsible Staff member or Physician of these: Fact sheet Admission consent Nurse assessment Physician orders Admin History and physical Laboratory Test results Operative notes Discharge Instructions Discharge Summary I have them answe..

What other reason could there be for anti-measles antibodies : If antibodies are found in a patients blood specimen against the measles virus, should the patient be quarantined because they are infected with the measles virus? What other reason could there be for anti-measles antibodies in the patient's blood..

Hypothetical population gene pool problem : In a hypothetical population's gene pool, an autosomal gene, which had previously been fixed, undergoes a mutation that introduces a new allele, one inherited according to incomplete dominance.

Red pigmentation in the head and throat : In the wild, male house finches (Carpodus mexicanus) vary considerably in the amount of red pigmentation in their head and throat feathers, with colors ranging from pale yellow to bright red.

Chances of hybridization between two tree finch species : About 13 different species of finches inhabit the Galápagos Islands today, all descendants of a common ancestor from the South American mainland that arrived a few million years ago.

Determine the initial concentration of cells : For a specific type of cell after 3 hours, the concentration of cells per ml of solution is about 400/mL. After 10 hours the concentration has gone up to 2000/mL.

Discussion on stable phenotype : What is meant by a "stable phenotype" for cells? How can one go about trying to ensure a stable phenotype in vitro?

Probability that a randomly selected mango : What is the probability that a randomly selected mango weighs less than 14 ounces?

User Account

All Pages