Question

QUESTION 9 What is the best evidence that O a The digestive tract is ventral to the nerve cord in verlebrates and dorsal to i in artbropods O d. Vertebrates start development as arthropods,then lio over QUESTION 10 2 DES QUESTION 2 The reason that we can use phylogenetic methods to identify who transmitted HIV to a Оа.HIV is an RNA virus that QUESTION 3 to

Answer 1

QN 9 C Developmental control genes expressed dorsally in vertebrates are ventrally in arthropods ,those expressed ventrally in vertebrates are expressed dorsally in arthropods.

A is wrong as the pattern could have arisen independently

C says that the two patterns derived from same ancestral condition.

Qn 2 HIV is a RNA virus that mutates rapidly enough that every population has a different population of variant.

*It is important that RNA sequences change rapidly but not so rapidly that all resemblance are erased.