Assume that the a and b loci are linked and separated by a distance of 20 map units on a chromosome (i. e., 20% recombination occurs between the two loci). a p0 cross is aabb x aabb. the f1 resulting from this cross is aabb. if you cross this f1 "dihybrid" to an individual with genotype aabb, what frequencies of genotypes do you expect in the following generation? (hint: the p0 generation tells you how the alleles are linked.)

Why do leaves change color in the fall? green pigments break down and no longer mask the color of chlorophyll. chlorophyll breaks down and no longer masks the colors of other pigments. red- and yellow-colored pigments grow and mask green-colored chlorophyll. green-colored chlorophyll breaks down and turns red and yellow.

Agroup of plant cells was exposed to radiation, which damaged the chloroplasts and caused them to lose function. if the mitochondria were unharmed, what would happen to the overall function of the plant cells? a. the cells would not be able to make food, but would be able to release energy from biomolecules. b. the cells would not be able to replicate dna, but would be able to break down waste. c. the cells would not be able to break down waste, but would be able to replicate dna. d. the cells would not be able to release energy from biomolecules, but would be able to make food.

After a signal is transmitted from the eyes through the optic nerve, which part of the brain processes the visual information? a. the limbic lobe b. the occipital lobe c. the frontal lobe d. the temporal lobe