{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

part three of the exam is on the next

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: on. ________________________ Part three of the exam is on the next page Page 4 of 5 BIO1130 Midterm Examination – November 13, 2010 STUDENT NUMBER:_______________________________ Don’t enter your name. 12 pts Part 3: Answer the following two questions in the space provided. What are the Protostomia and what are the major events in the evolution of this animal taxon? 3points for Protostome characters {Mesoderm and body cavity from schizocoely/mesoderm block arises near blastopore and splits to form cavity}{Spiral cleavage – at eight cell stage top four cells spiral/shift and sit between the bottom four}{Blastopore becomes the mouth/Anus forms opposite the blastopore} If the word shizocoely and spiral cleavage appear without an explanation give only one point as a part mark. There must be an explanation to show that the student knows what the terms means. If it is there then the full two points can be given. 3 points for evolutionary sequence: {colonial coanoflagellate developed tissues,}{three tissue layers – triploblastic}{Bilateral symmetry} What is gene fixation and how does it come about; what are the consequences for a population that experiences it. What is the {Form of Natural selection}{When there is high selective pressure}{against a phenotype or Allele}{Allele/phenotype disappears completely from the population}{Consequence: the remaining allele is fixed and a genetic variant is lost}{example strong selection has resulted in disease/plant/insect resistance to control teatments – flavour in tomatoes/ breeding for packaging and transport resulted in the flavour genes being lost} Page 5 of 5...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online