EXTRA CREDIT (5 points). This question will not count against you if you get it

Question

EXTRA CREDIT (5 points). This question will not count against you if you get it wrong Circle your answer among the choices below. Swine A Human Scotland 94 Nebraska 92 St-Hyacinthe 91 Ehime 80 Mangolia 91 CHR sconsin 98 Mongoia 85 USSR 77 Leningrad 54 Klev 79 New Jersey 76 Ilinols 63 Wlsconsin6 100 Fort Monmouth 47 Mongolia 88 1D0y PR 34 Alma Ata 84 St-Hyacinthe 90 Tokyo 67 NWS 33 WSN 33 lowa 30 C1 Cambridge 39 South Carolina 1918 Swine Nebraska 92 StHyacinthe 91 Wisconsin 98 80 Human New Jersey 76 Scotland 94 llinois 63 Wisconsin 61 Mangalia g1 CHIA 83 Suita 89 Leningrad Cambridge 39 Kiev 79 Mongola 88 Fort Monmout4PA34 Alma Ata 84 90 WSN 33 lowa 30 Tokyo ENws 3 South Carolina 1918 The trees above show the phylogeny estimated for the same mammalian HI influenza (flu') based on portions of the haemaglutin genes. Tree A above was estimated from nucleotide bases 310-870 whereas Tree B was estimated from bases 1070-1650. Under the assumption that these trees are correctly rooted, how does this result support the inference that the S. Carolina 1918 strain (from the deadly 1918 flu pandemic) arose from recombination between a human and a swine virus? a. The fact that the S. Carolina 1918 strain is near the root of both trees suggests that it is of mixed identity The fact that the S. Carolina 1918 strain is more closely related to the swine strains in tree A and to the human strains in tree B. e. The fact that the S. Carolina 1918 strain is a direct ancestor of all the swine strains in tree A but was isolated from a human. e fact that the S. Carolina 1918 strain is more closely related to the lowa 30 strain than to the Scotland 94 human strain in both trees.

Explanation / Answer

Answer is A. The fact that the S. Carolina 1981 strain is near the root of both trees suggest that it is of mixed identity.

Explanation : Becuase both are near to root it indicates that both are originated by the recombination

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