Tuesday 8 November 2011

Question 4

This is the last example from the question sheet that you can download online.


Two true-breeding minks were crossed.  Between them there were three loci that were being analyzed:  drawn jowls, club foot, and a behaviour of being easily startled.  The F1 minks were all wild-type in appearance.  The F1 females were testcrossed and the progeny sorted.  The following data were obtained:


Phenotype

Number

drawn jowls, normal foot, easily startled
157
normal jowls, club foot, calm
165
normal jowls, club foot, easily startled
15
drawn jowls, club foot, calm
139
drawn jowls, club foot, easily startled
14
normal jowls, normal foot, calm
21
drawn jowls, normal foot, calm
18
normal jowls, normal foot, easily startled
163
  1. Define appropriate gene and allele symbols according to standard conventions.
  2. Draw a genetic map based on these data.
  3. What can you infer about these loci?



My students often find that this one is tricky!  See if you can spot the hard part before you view the solution below.

(You can get a full-screen version by clicking on the "YouTube" logo at the bottom-right corner of the video above.)

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