18.  The diagram below shows spermatogenesis (on the left) and oogenesis (on the right) followed by a fertilization event.  The numbered circles are cells.  The long purple bars in the cells are X chromosomes while the short blue bars in the cells are Y chromosomes.  Cell #8 is the zygote resulting from fertilization.          a.  Where has the non-disjunction occurred?  Use the number to the upper left of the cell to help you explain the location of the non-disjunction.       b.  What non-disjunction syndrome does this illustration demonstrate?  How do you know?

13.  The roseatte spoonbill is a bird that lives in mangrove marshes and captures insects with a long spoon-shaped bill.  Bill color is due to a gene that has two incompletely dominant alleles.  Individuals that are homozygous for one allele have a black bill.  Individuals that are homozygous for the other allele have a bill that is almost white. What color bill will heterozygous individuals most likely express?  Explain the reasoning/rationale behind your answer.

7.  Which one of the following correctly describes the activity of the Xist gene responsible for X-inactivation?

5.  Match the allele combination with the correct term used to describe that genotype combination.

4.  Which of the following are assumptions of Mendelian genetics?  Select all correct choices.

16.  The illustration below shows a chromosome on which the loci (locations) of 4 linked alleles (a, B, C, and d) have been mapped.   Which two alleles are least likely to be “unlinked” during crossing over?  Why did you pick these two alleles?

12.  Which one of the following is the “purpose” of a one-trait test cross?

8.  A couple has a child who has blood type AB.  What one blood type can neither of the parents be?  Explain the reasoning/rationale behind your answer.

“Procaryotes” used to be called __________________

Which of the following are nursing considerations when maintaining a client’s traction device?  “Select All that Apply.” a. rope should be strung through the pulleys.b. assess for the correct poundage.c. know the reason for the traction.d. be sure the weights rest squarely against the floor.e. know that the physician may change the prescription of applied force over the course of treatment