You are mapping three loci in Brandywine apricot trees (Prunus brandybucki), an important agricultural species in the Shire.  In Brandywine apricot trees, sour fruit (fr+) is dominant to fishy-tasting fruit (fr), blue flowers (b+) is dominant to yellow flowers (b), and short, bushy height (sh+) is dominant to tall, tree-like height (sh).  You perform a testcross with a plant that is heterozygous for all three loci and get the following offspring:

Human Anatomy & Physiology (11th Edition)
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 You are mapping three loci in Brandywine apricot trees (Prunus brandybucki), an important agricultural species in the Shire.  In Brandywine apricot trees, sour fruit (fr+) is dominant to fishy-tasting fruit (fr), blue flowers (b+) is dominant to yellow flowers (b),
and short, bushy height (sh+) is dominant to tall, tree-like height (sh).  You perform a testcross with a plant that is heterozygous for all three loci and get the following offspring:

 

Fruit flavor

Flower color

Plant height

Observed Counts

fr+

b+

sh+

61

fr

b

sh

53

fr+

b+

sh

11

fr

b

sh+

7

fr+

b

sh

277

fr

b+

sh+

285

fr+

b

sh+

156

fr

b+

sh

150

 

 

Total

1000

 

 

What is the recombination frequency between b and sh?

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