In a certain plant, yellow leaves are dominant (Y) and ted leaves are recessive (y). A plant with genotype Yy and a plant with YY are crossed. if they have four offspring, how many would you predict would have red leaves? (Hint: Draw a Punnet Square to help you determine the answer.) A. 2
B. 0
C. 1
D. 3

Compare and contrast region e in the illustration above with region d. describe the physical characteristics of each region.

Examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. polyploidy is creating new species. the two populations are not interbreeding freely. hybrid offspring of the two populations begin to appear. one species will increase into a population size twice as large as the other species.

Which identifies the main purpose of biological taxonomy?