Bio experts!
human eye color is a polygenic trait. the normal development of eye color requires the coordinated control of these genes. which statement best describes how this control is coordinated?
a. genes involved in related functions are arranged into a single operon with a promoter that activates all genes simultaneously.
b. the genes share a specific combination of control elements.
c. the genes are clustered as tandem repeats with a shared promoter region.
d. the genes are splice variants of a single sequence that is activated with a single promoter and then modified post-transcriptionally.

Read the following scenario to answer the following question. in some zoos, rare crosses between a male lion and a female tiger have produced hybrid offspring called "ligers." male ligers are sterile but some female ligers are fertile. in the wild, lion and tiger ranges do not naturally overlap, making such a cross unlikely. furthermore, the solitary behavior of tigers and the social organizations of lions create behavioral differences. applying the biological species concept, the sterility of ligers reveals that a. lions are probably a subspecies of tigers b. tigers and lions are the same species c. a new species called "ligers" is forming d. tigers and lions are separate species

Which sentence best describes the relationship between chlorophyll and the chloroplast? a.)chlorophyll is a chemical found in a chloroplast. b.) chloroplast is a chemical found in a chlorophyll. c.) both chlorophyll and chloroplasts are found in animals. d.) both chlorophyll and chloroplasts make carbon dioxide.

In the respiration-photosynthesis cycle shown above, what are the products of cellular respiration that belong in box 2?