This graph shows data on melatonin concentrations in the pineal glands of deermi

Question

This graph shows data on melatonin concentrations in the pineal glands of deermice, as collected from wild populations in Michigan during three different seasons (A, B, and C).

Write a paragraph in which you convince the reader that the curves provide you with enough information to assign each letter to a particular season. Your answer should include the photocycle, i.e., the number of hours of light and the number of hours of dark in each of the three seasons and any irregularity you see on the graph (you should still be able to figure out what is going on). Note that the samples were collected in the sequence shown in the letters: A first, B second and C third.

Explanation / Answer

In season A, the melatonin levels are in peak (500 pg/ml) at 10 am (a gradual increase from 4-10hr), then, it slightly reducing by 12 pm (500 to 300 pg/ml), after that by 2 pm the levels are more or less equal to 12 pm (300-400 pg/ml). After 2 pm, there is a gradual reduction in melatonin levels by 6 pm. (it is light dependent production)

In season B, the melatonin levels not altered until 8 am, but after 8 am, it suddenly increased by ~50% (~300 pg/ml) at 10 am of maximum melatonin production that shown at 4 pm (500 pg/ml). But 10 am to 2 pm the ~50% levels were maintained. Thereafter, 2 pm to 4 pm, it increased to peak levels and fall down to basal level by 6 pm.

In season C, the melatonin production started after 12 pm to 4 pm in the peak dropped suddenly from 4 pm to 6 pm.

Only in season A and B there is variation in the production of melatonin at different time of the day but such an effect not observed in season C.

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.