Question

In Garden peas, tall vine is dominant and short vine is recessive. If a homozygous tall plant is crossed with a homozygous short plant, what genotypes are possible in the F1 generation?

Answer 1

So the first step you want to take in any genetics problem like this is to assign some letters....let's say T = your dominant gene, and t = your recessive one.

The cross then, is represented by: TT x tt right?

After drawing out your square....you should get Tt in all four boxes.

Answer 2

Okay so look at this drawing. If T= dominant gene (tall vine) and t+ recessive gene (short plant)
So you draw a table. The top row has the dominant genes and the side column has the recessive genes. Now in the boxes just bring down the dominant than recessive gene.
All of the boxes should have Tt.
I hope this helps!

Answer 3

Both of these answers are good - the potential gametes of each plant are shown on the axes of the punnet square above so the table shows all potential offspring. If you want to delve into this a little further then you could try to figure out the potential offspring from crossing the offspring shown in the table. The offspring are heterozygous but 1/4 of their offspring should be homozygous for the dominant allele and 1/4 offspring should be homozygous for the recessive allele.