In corn the dominant allele P causes purple corn kernels, and the recessive allele p causes white kernels. On a separate chromosome pair is another gene effecting kernel texture. The dominant allele R causes round kernels, and the recessive allele r causes wrinkled kernels. If PpRr plant is crossed to another PpRr plant, what is the expected phenotypic ratio of the F1 plants? �

Select one:
a. 9 white wrinkled : 3 purple wrinkled : 3 white round : 1 purple round
b. 9 purple round : 3 purple wrinkled : 3 white round : 1 white wrinkled
c. All purple round
d. 3 purple round : 1 white wrinkled
e. 3 purple round : 3 purple wrinkled : 1 white round : 1 white wrinkled

hammurabi rulers

good lesson

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg 

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.

one part of the electromagnetic spectrum that arrives on earth as solar radiation from the sun is the visible spectrum. wavelengths of the visible spectrum combine to form what we refer to as

answer - d) ultraviolet radiation.

violet /   380–450 nm / 668–789 thz

violet is number 1 in the chart of visible light.