5. Consider the following phylogenetic tree r H.sapiens M.musculus 96 56- B.taur

Question

5. Consider the following phylogenetic tree r H.sapiens M.musculus 96 56- B.taurus X.tropicalis D.rerio C.idella Vertebrates 100 97 L.punctatus S.exigua 84 M.separata S.litura H.virescens Insects 52 98 Invertebrates B.mori M.sexta D.melanogaster M.japonicus P.fucata 69 72 H discus discus Z.mays A. thaliana Plants 100 C.sinensis S.cerevisiae Fungi 005 a) (2pt) Is this a cladogram or a phylogram? b) (2pt) Which sequence(s) is/are presumably the outgroup? c) (2pt) Which sequence is most closely related to A.thaliana? d) (2pt) Circle (on the tree above) the last common ancestor of M. musculus and D. rerio e) (2pt) Which branch(es) do you have the least confidence in? Why?

Explanation / Answer

Ans a.This is a phylogram showing evolution of species with respect to time.

b .homo sapiens, X.tropicalis, D.rerio, S.lithura,H.verescens,B.mori,M.sexta, D.melanogaster, M.japonicus,      Z.mays, S.cerevisaie

c.c.sinensis is closely related to A.thaliana because they both share close common ancestor.

d. D.rerio shred last common ancestor at 97 and M.musculus shared last common ancestor at 99.

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