Question

In tomatoes, red fruit color (Y) is the dominant allele to yellow (yy) fruit color; and...

In tomatoes, red fruit color (Y) is the dominant allele to yellow (yy) fruit color; and tallness (D) of the plant is the dominant allele to dwarfism (dd). If pure breeding strain of a tall, red fruited variety is crossed with a pure breeding strain of dwarf, yellow fruited variety. Give the genotypes of these parents, and the phenotypic and genotypic ratio in the F1, and F2 generations.

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Answer #1

Parents

Genotype

YYDD

X

yydd

Phenotype

Red and Tall

Yellow and Dwarf

F1 generation

Genotype

YyDd

Phenotype

Red and Tall

F2 generation

Cross

Gametes

YD

yD

Yd

yd

YD

YYDD

YyDD

YYDd

YyDd

Red and Tall

Red and Tall

Red and Tall

Red and Tall

yD

YyDD

yyDD

YyDd

yyDd

Red and Tall

Yellow and Tall

Red and Tall

Yellow and Tall

Yd

YYDd

YyDd

YYdd

Yydd

Red and Tall

Red and Tall

Red and dwarf

Red and Dwarf

yd

YyDd

yyDd

Yydd

yydd

Red and Tall

Yellow and Tall

Red and dwarf

Yellow and Dwarf

Phenotypic ratio

Red and tall

Yellow and Tall

Red and Dwarf

Yellow and Dwarf

9:3:3:1

9

3

3

1

Genotypic ratio

YYDD

YyDD

YYDd

YyDd

yyDD

yyDd

Yydd

yydd

YYdd

1

2

2

4

1

2

2

1

1
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