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
|
- Define appropriate gene and allele symbols according to standard conventions.
- Draw a genetic map based on these data.
- 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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