Two highly inbred tobacco plants are crossed. one has dark green leaves. the other has yellow leaves. the f1 have light green leaves. five hundred progeny from f1 × f1 crosses are analyzed. their leaves show continuous variation in color, but none has dark green or yellow leaves. what do these data suggest about the number of genes determining this trait?
a) there are two genes that determine this trait.
b) there are more than four genes that determine this trait.
c) there are three genes that determine this trait.
d) there are four genes that determine this trait.
e) there is not enough information to estimate the number of genes.

Nh3 +02-no + h20 is unbalanced what is the balanced equation

(me out over the last several centuries, scientists have made the following broad observations while investigating several branches of the life sciences: -the fossil record shows that different types of organisms have existed at different times in earth's history. -many organisms have similar body structures that seem to be adapted to different ways of living in their environment. -organisms of different species often share similarities in stages of embryonic development. -many species share genetic similarities, and almost all organisms use the same basic building blocks to construct proteins. -often, the extent of two species' similarities can be predicted from their geographic closeness to each other. -a great deal of change has been observed among species that have experienced strong selective pressures through many generations. scientists have carefully considered and rigorously tested the observations listed above. when scientists offer a of these observations, they are making 1.) testable explanation, deductive explanation 2.) scientific interference, scientific law

Waste water from industries and domestic sources can be treated by chlorination or ultraviolet radiation. there are pros and cons to using either chlorine or uv radiation to kill harmful microorganisms. what is one reason chlorination would be preferred over ultraviolet radiation? a) chlorine only eliminates visible impurities and is ineffective against microorganisms. b) chlorine not only kills bacteria but provides a residual effect on returning microorganisms. c) uv radiation can be used only to treat drinking water and is ineffective in treating waste water. d) ultraviolet radiation is more effective