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
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
Biology: The Unity and Diversity of Life (MindTap Course List)
15th Edition
ISBN:9781337408332
Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Chapter14: Chromosomes And Human Inheritance
Section: Chapter Questions
Problem 5GP: Human females have two X chromosomes (XX); males have one X and one Y chromosome (XY). a. With...
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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?
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