Any organism with a notochord and a dorsal nerve cord is classified in subphylum Vertebrata.
O True
O False

False

Explanation: The phylum Chordata (chordates) includes two other subphyla: Cephalochordata (e.g. lancelets) and Urochordata (e.g. tunicates). Both subphyla encompass organisms which do possess a notochord and a dorsal nerve cord, lost after the embryonic stage or otherwise.

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.