The growth of a follicle during the follicular phase of the cycle is stimulated most directly by ______.
A. luteinizing hormone
B. follicle-stimulating hormone
C. progesterone
D. GnRH
Answer: B. follicle-stimulating hormone
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Peter and Rosemary Grant study natural selection in finches on the Galápagos Islands. They have hypothesized that dry condition produce larger seeds and may result in larger beaks in succeeding generations of finches. The figure below shows their data from 1976 and 1978. The y-axis is the number of birds measured and the x-axis is the beak depth. Do their data support their hypothesis and why?
A. Yes; because there were more birds measured in 1978 after the drought, therefore they must have been able to get food and reproduce.
B. Yes; because the average beak depth of birds in the population increased from 8.8mm in 1976 to 9.8mm in 1978.
C. No; because even though more birds were measured in 1978, the beak size of the upper range was smaller.
D. No; because in 1976, before the drought, the largest beak depth was still 11.3mm.
E. No; more data would be necessary to show a support of their hypothesis.
When plants bend toward or away from a light source, what is this called and which type of light causes the response?
a. phytochromism, far red light b. photoperiodism, red light c. phototropism, blue light d. photosynthism, both red and blue light
The rapid change in G6PD allele frequency and the correlation of this allele with areas of high rates of malaria
suggests that ____ explains this change in G6PD allele frequency. a. genetic drift b. artificial selection c. X-linked inheritance d. the founder effect e. natural selection
What three features are common to all respiratory systems?
What will be an ideal response?