Examine the following table of cross data; genotypes of parents are unknown and

Question

Examine the following table of cross data; genotypes of parents are unknown and may be different in each cross: Offspring Phenotypes Black, normal Black, waltzer Albino, normal Albino, waltzer Crosses .Albino, normal x 25 4 Black, waltzer 2. Black, waltzer x Albino, waltzer 13 13 39 . Albino, normal x 49 51 black, normal 4. Albino, waltzer x albino, waltzer6 18 54 5. Black, normal x 4 6 Albino, waltzer A. Using evidence from each cross, state the mode of inheritance underlying these traits. Explain your reasoning fully. B. Using your hypothesis, deduce the genotypes of each parent in the five crosses. Use allele symbols of your choice

Explanation / Answer

1. Albino = BB or Bb
Black = bb
Normal = ww
Waltzer = WW or Ww

Bbww (Albino, Normal) X bbWw (Black, waltzer) - Mendel inheritance

      Bw and bw X bW bw

     BbWw Bbww bbWw bbww (1:1:1:1)

2. bbWw (Black, Waltzer) X BbWw (Albino, waltzer)

     bW, bw X BW, Bw, bW, bw

BbWW, BbWW, BbWw (Albino, waltzer) 3
bbWW, bbww, bbWw (Black, Waltzer) 3
Bbww (Albino, Normal) 1
bbww (Black, Normal) 1
  

3. Bbww (Albino, Normal) X bbww (Black, Normal)

        Bw and bw   X bw

           Bbww (Albino, Normal) :   bbww (Black normal)

4. BbWw (Albino, waltzer) X BbWw (Albino, waltzer)

           Dihybrid cross 9 (Albino, waltzer):3 (Albino, Normal):3 (Black, waltzer):1 (Black, Normal)

5. bbww (Black, Normal) X BbWw (Albino, waltzer)

             bw X BW, Bw, bW, bw

           BbWw Bbww bbWw bbww (1:1:1:1)

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