S S S or y Gametes Gametes (A) F, gametes 4 sY 4 sy V4 SY 4 Sy SSYY SsYy SSYY SSYY 4 SY 46 46 V46 46 SSyy SsYy Ssyy SSYY V4 Sy 46 16 16 46 SSYY ssYy Ss YY SsYy V4 SY 46 46 46 46 Ss Yy Ssyy ssYy ssyy VA sy 46 46 (B) FIGURE 16-17 (A) During anaphase I, chromosomes move independently of each other, so one pole receives S and the other receives s; likewise, one gets Y and the other y. But in about half the cells, both S and Y move to the same spindle pole by chance, whereas in other dividing cells, one spindle pole receives S and y, again by chance. (B) A Punnett square for a dihybrid cross is set up just like one for a monohybrid cross; establish the types and relative abundance of gametes, and then fill in the squares. The table looks a little formidable, but it really consists of two 3:1 ratios intermingled. F, gametes

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Figure shows a dihybrid cross but it can be analyzed as a monohybrid cross of just smooth seed coat (S) and wrinkled seed coat (s) with complete dominance that should show a 1:2:1 ratio. Examine Figure and see if you can find these results. Likewise, it can be analyzed as a monohybrid cross of yellow seed coat versus green. Can you find these in the expected ratio?

S
S
S
or
y
Gametes
Gametes
(A)
F, gametes
4 sY
4 sy
V4 SY
4 Sy
SSYY
SsYy
SSYY
SSYY
4 SY
46
46
V46
46
SSyy
SsYy
Ssyy
SSYY
V4 Sy
46
16
16
46
SSYY
ssYy
Ss YY
SsYy
V4 SY
46
46
46
46
Ss Yy
Ssyy
ssYy
ssyy
VA sy
46
46
(B)
FIGURE 16-17 (A) During anaphase I, chromosomes move independently of
each other, so one pole receives S and the other receives s; likewise, one gets Y and
the other y. But in about half the cells, both S and Y move to the same spindle pole
by chance, whereas in other dividing cells, one spindle pole receives S and y, again
by chance. (B) A Punnett square for a dihybrid cross is set up just like one for a
monohybrid cross; establish the types and relative abundance of gametes, and then
fill in the squares. The table looks a little formidable, but it really consists of two
3:1 ratios intermingled.
F, gametes
Transcribed Image Text:S S S or y Gametes Gametes (A) F, gametes 4 sY 4 sy V4 SY 4 Sy SSYY SsYy SSYY SSYY 4 SY 46 46 V46 46 SSyy SsYy Ssyy SSYY V4 Sy 46 16 16 46 SSYY ssYy Ss YY SsYy V4 SY 46 46 46 46 Ss Yy Ssyy ssYy ssyy VA sy 46 46 (B) FIGURE 16-17 (A) During anaphase I, chromosomes move independently of each other, so one pole receives S and the other receives s; likewise, one gets Y and the other y. But in about half the cells, both S and Y move to the same spindle pole by chance, whereas in other dividing cells, one spindle pole receives S and y, again by chance. (B) A Punnett square for a dihybrid cross is set up just like one for a monohybrid cross; establish the types and relative abundance of gametes, and then fill in the squares. The table looks a little formidable, but it really consists of two 3:1 ratios intermingled. F, gametes
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