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The Classic Crosses:
Numerical Results
Ratio
Parent
Genotypes
1.
67 Tall:
all Tall
TT x tt; TT x Tt.
2.
95 Tall, 29 Small
3:1
Tt x Tt
3.
74 Tall, 79 Small
1:1
Tt x tt
FRFW x FRFW
Rr x Rr
(incomplete
dominance)
4.
45 Red, 88 Pink, 47 White
1:2:1
5.
Red Eye Female 88
White Eye Female 0
Red Eye Male 42
White Eye Male 47
gender
Sex Linked Gene
difference
Rr x Rno white eye
Female x male
females
6.
Blood Group A x Blood Group B
Combine the results of all four
crosses.
Four Possible AA x BB, AA x Bo,
Crosses
Ao x BB, Ao x Bo.
7.
953 Tall Round
all Tall Round TTRR x ttrr
8.
1842 Tall Round, 597 Tall
Wrinkled, 612 Small Round, 204
Small Wrinkled
9:3:3:1
(non-linked: genes are on different
chromosomes)
TtRr x TtRr
9.
763 Tall Round, 756 Tall Wrinkled,
731 Small Round, 766 Small
1:1:1:1
Wrinkled
TtRr x ttrr
Grey Normal 100, Black Twisted
10. 99, Grey Twisted 11, Black
Twisted 9
1:1 + 1:1
Linked Genes
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