ap biology genetics question about phenotypes?

Question

True-breeding tall red-flowered plants are crossed with dwarf white-flowered plants. The resulting F1 generation consists of all tall pink-flowered plants. assuming that height and flower color are each determined by a single gene locus, predict the results of an F1 cross of the TtRr plants. List the phenotypes and predicted ratios for the F2 generation.

Answer 1

Color must be a matter of incomplete dominance.
RR = red
WW = white
RW = pink

Height must be a matter of simple Mendelian dominance
T = tall (tall plants are either TT or Tt)
t = short (short plants are tt)

F1 cross: TtRr x TtRr
Four kinds of gametes from each parent: TR, Tr, tR, tr.
Put four of the gametes across the top of the Punnett square.
Put four of the gametes down the side of the Punnett square.
The Punnett square is 4x4 with 16 squares.

When you get the phenotype ratio, you will have a combination of the height (3 tall: 1 short) and the color (1 red: 2 pink: 1 white). So the phenotype ratio overall will be:

3 tall, red:
6 tall, pink:
3 tall, white:
1 short, red:
2 short, pink;
1 short, white

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Answer 3

First I have to say, congrats on the AP class, and I'm also taking the test in May.

Also assuming the genes are not linked, you need to draw a punnet square (which I can't represent here). Recognizing that the (T) genotype is dominant, and the (R/r) genes are co-dominant, you can estimate the phenotypes for a TtRr cross.

Also recognizing it is a Dihybrid Cross (TtRr) the ratios will always be the same:

Phenotype will always be 9 : 3 : 3 : 1
Genotype will always be 1 : 2 : 1 : 2 : 4 : 2 : 1 : 2 : 1

Since one of the types is codominant, you will probably want to use the genotype ratio:

1 TTRR
2 TTRr
1 TTrr
2 TtRR
4 TtRr
2 Tt rr
1 ttRR
2 ttRr
1 ttrr

So there are 3 Tall red flowers ( TTRR, TtRR)
There are 6 tall pink flowers (TTRr, TtRr)
There are 3 tall white flowers (TTrr, Ttrr)
There is 1 dwarf red flower (ttRR)
There are 2 dwarf pink flowers (ttRr)
There is 1 dwarf white flowers (ttrr)

Have fun!