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roltschj roltschj
wrote...
Posts: 537
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6 years ago
If the gene for yellow body color (y) is an X-linked
  recessive and its dominant counterpart (y+) produces
  wild body colors, give the phenotypes expected and
  their frequencies for the following four crosses:
  (a) yellow female x wild male
  (b) wild carrier female x wild male
  (c) wild carrier female x yellow male
  (d) homozygous wild female x yellow male What will be an ideal response?
 
 

Question 2

In Drosophila, a narrow, reduced eye is called a bareye.
  It is due to a dominant X-linked allele (B),
  whereas the full wild-type is due to the recessive
  gene (B +). Give the F1 and F2 genotypic and
  phenotypic expectations of a cross of a homozygous
  wild-type female with a bar-eyed male. What will be an ideal response?
 
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Replies
wrote...
6 years ago
Answer to q. 1

Answer: (a) yellow male wild female; (b)1/4 wild male, 1/4 yellow
male, 1/4 wild female, 1/4 wild carrier female; (c) 1/4 wild
male, 1/4 yellow male, 1/4 yellow female, 1/4 wild carrier
female; (d) 1/2 wild carrier female, 1/2 wild male

Answer to q. 2

Answer: B+B+ x BY > F1: B+B wild female B+Y wild
male F2: 1/4 BY bar male, 1/4 B + Y wild male 1/4 B
+ B + wild female 1/4 B + B wild female
roltschj Author
wrote...
6 years ago
Wow! Thanks you for this correct set of answers, wasn't expecting it...
wrote...
6 years ago
My pleasure!
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