Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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a) What gene is in the middle?

b) Calculate the genetic distances (in centimorgans, cM) between:

  • genes b and cn:
  • genes cn and wx:
  • genes b and wx:

c) Calculate the interference

In Drosophila, three recessive genes produce black body (b), waxy wings (wx) and cinnabar eyes (cn). A female heterozygous for these
three genes is testcrossed, and 1000 progeny are classified as follows (letters denote recessive phenotypes and pluses denote wild-type
phenotypes):
Phenotypes
# progeny
+ + +
b wx cn
+ WX cп
69
b + +
67
+ + cn
382
b wx +
379
+ WX +
48
b + cn
44
Total
1000
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Transcribed Image Text:In Drosophila, three recessive genes produce black body (b), waxy wings (wx) and cinnabar eyes (cn). A female heterozygous for these three genes is testcrossed, and 1000 progeny are classified as follows (letters denote recessive phenotypes and pluses denote wild-type phenotypes): Phenotypes # progeny + + + b wx cn + WX cп 69 b + + 67 + + cn 382 b wx + 379 + WX + 48 b + cn 44 Total 1000
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