Which of the Following Are True of Color Vision in New

Multiple Choice

Which of the following are true of color vision in New World monkeys?

A) Both male and female howler monkeys have trichromatic vision.
B) Many species maintain multiple alleles of the red/green opsin gene in the population.
C) Random X-inactivation would allow a female monkey heterozygous for two opsin alleles with differing spectral sensitivities to distinguish red and green.
D) A shared regulatory region likely ensures that only one opsin gene (red or green) is expressed in each cone cell in howler monkeys.
E) All of the above