Question 1b

The first example was pretty straightforward:  two genes.

Now let's take a look at what happens when we add another gene!  This is question 1b.
*don't forget to try out the worksheet first!*

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Two more true-breeding lizards were crossed.  Three mutant traits were found in the parents: bent tail, missing thumb, and curled claws.  The F₁ lizards were all wild-type in appearance.  The F₁ females were testcrossed, and the offspring were sorted to obtain these data:

Phenotype	Number
wild type	182
bent tail, missing thumb, curled claws	176
bent tail, missing thumb	5
missing thumb, curled claws	52
bent tail	55
bent tail, curled claws	2261
missing thumb	2279

1. Diagram the arrangement of alleles on the two homologous chromosomes for both parents (P generation) and the F₁.
2. Draw a genetic map based on these data.  Be sure to mathematically correct for double-crossovers.
3. Calculate interference.  Explain what this value means.

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The solution for the question is below.

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