So first off homozygous means that both alleles are the same
If coiling to the right is dominant and to the left is recessive let capital c (C) represent right coiling and let lower case c (c) represent left coiling.
The female who is homozygous recessive must have both recessive alleles
The male who is homozygous must have two dominant alleles
So the cross will be between a CC and a cc
So we set up a Punnett square
We take a look at all the combinations and arrange them
So we find that there is a 25% chance of the offspring having left coiling
If coiling to the right is dominant and to the left is recessive let capital c (C) represent right coiling and let lower case c (c) represent left coiling.
The female who is homozygous recessive must have both recessive alleles
The male who is homozygous must have two dominant alleles
So the cross will be between a CC and a cc
So we set up a Punnett square
We take a look at all the combinations and arrange them
So we find that there is a 25% chance of the offspring having left coiling