9a. Couple’s parts AA SS AA SS
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AS AS
The couples are both AS
The probability of having an affected child is ¼
AS AS
AS AS AS SS
9b. The man SS wife AA
SS AA
AS AS AS AS
None of the children will be affected but they will be carriers
12. Aabb ?? Ab, Ab, ab, ab (50:50)
AABb ?? AB, Ab, AB, Ab (50:50)
AaBb ?? AB, Ab, aB, ab (25:25:25:25)
16. S ? Smooth, s? wrinkled
Y? Yellow y, ? green
Parents SSYY × SSYY
Offspring SsYy SsYy SsYy SsYy
19. B ? brown, b ? red
P ? normal P ? albinism
bb, bb B bb
bbpp BbPp
BPbp bbpp, BPbp
(a) She has red
(b) bb
(c) Bb, Pp
(d) Bb, Pp
(e) bb, red hair/ Bb, brown hair
28. A B
AB B O
30. A, B, C, d
(b). AB, AC, Ad, BC, Bd, Cd, AA, BB, cc, dd
(c) Only 7 phenotypes are possible.
