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Facilitator Questions
Q: What led to the geographic and biological isolation of New and Old World species, and when did this happen? What are some other examples of geographic isolation that has led to biological divergence? Q: Name some non-primate animals that have good color vision. Q: Compare the geometric representation of human color perception based on cone photoreceptor sensitivities vs. retinal ganglion cell activity. Q: Current evidence suggests that the locus control region (LCR) adjacent to the M and L pigment gene array pairs with a single M or L pigment gene promoter to direct gene transcription in M or L cones, respectively. If this pairing and the associated transcriptional choice constitutes the only difference in gene expression between M and L cones, and if it occurs by a random choice of LCR binding to either the M or L pigment gene promoter, then what would be the predicted effect on cone identity and number of losing all but one of the pigment gene?
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