Hi!

If I have two plants with the genotypes Rrtt and rrTt where red color(R) is dominant over white(r) and being tall(T) is dominant over being short(t).If I complete a Punnet square, will it look loke this:
R r r r
t Rt rt T rT rT
t rt rt t rt rt
How can I diagram a cross between these plants(this is dihybrid cross)with sixteen boxes?What could be the possible genotypes and phenotypes from this cross?
Thanks a lot for helping!

The only possibilities for the first plant are Rt and rt. Put that across the top. The only possibilities for the second plant are rT and rt. Put those on the side. You can determine the total possible combinations within a four-box diagram. This will give you the genotypes. From them, you can determine the phenotypes.

I hope this helps.

To diagram a dihybrid cross between two plants with the genotypes Rrtt and rrTt, you can use a 4x4 Punnett square. Here's how you can create the Punnett square:

Step 1: Write down the alleles for each parent vertically on the left and top sides of the square.
The first parent has the genotype Rrtt, so write down the alleles R and r on the left side of the square, and t on the top side.
The second parent has the genotype rrTt, so write down the alleles r and r on the left side of the square, and T on the top side.

Step 2: Combine the alleles in the corresponding boxes.
For each box in the Punnett square, combine the allele from the left side with the allele from the top side. For example, in the first box, combine the R from the first parent with the r from the second parent, resulting in the genotype Rr. Do the same for all the other boxes in the square.

The final Punnett square will have 16 boxes, and it will look like this:

```
R r r r
t | Rt | Rt | rt | rt |
t | rT | rT | rt | rt |
t | rT | rT | rt | rt |
t | rt | rt | rt | rt |
```

Now, let's determine the possible genotypes and phenotypes resulting from this cross:

Genotypes:
- RRtt: 2 boxes (Rt, Rt)
- RrTt: 4 boxes (Rt, Rt, rT, rT)
- RrTt: 4 boxes (rt, rt, rt, rt)
- rrTt: 2 boxes (rt, rt)

Phenotypes:
- Red and tall: 2 boxes (Rt, Rt)
- Red and short: 4 boxes (Rt, Rt, rt, rt)
- White and tall: 4 boxes (rT, rT, rT, rT)
- White and short: 6 boxes (rt, rt, rt, rt, rt, rt)

Therefore, the possible genotypes from this cross are RRtt, RrTt, and rrTt, and the possible phenotypes are red and tall, red and short, white and tall, and white and short.

I hope this helps! Let me know if you have any further questions.