Week 9 Notes
Popular in Fundamentals of Biology II: Ecology and E
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This 1 page Class Notes was uploaded by Chasia Notetaker on Sunday April 3, 2016. The Class Notes belongs to BIOL 12000 at Ithaca College taught by Nancy L Jacobson in Fall 2016. Since its upload, it has received 8 views. For similar materials see Fundamentals of Biology II: Ecology and E in Biology at Ithaca College.
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Date Created: 04/03/16
Week of March 28, 2016 Allelic trichromacy has two mws alleles for the same gene alleles differ in their wavelength sensitivities (some are even similar to the lws duplicative trichromacy) mws i son x chromosome males (xy) can only have one mws so are dichromats m1 m2 my or my females (xx) can have one or two alleles, if XX or XX or XX 2 m1 m2 Food selection research has linked trichromatic color vision with the ability to select ripe food research suggests that trichromatic vision is more likely to be selected for when food is distinguished from nonfood by color research suggests that dichromatic vision is more likely to be selected for when food is distinguished from non food by shape Why new world monkeys have allelic trichromacy? may be ancestral two species of lemurs are allelic trichromats to find cryptic fruit may be easier for dichromats to find probably important when there aren’t other fruits around trichromatic females could show others where ripe fruits are \ selection for trichromatic females would maintain both M alleles in the population example of balancing selection maintains stable frequencies of dichromats and trichromats in the population Why are all old world monkeys and apes trichromatic? with the duplication and nucleotide substitutions, males and females are both trichromatic during the time when the mutation appeared there was an extinction of many palms (ad maybe figs) no selection for dichromacy instead, where there were no fruit, probably ate young leaves which are often red some species eat only leaves selection for being able to distinguish ripe fruit would probably lead to coevolution
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