I am just a little confused with this question:

So, in a diploid organism, I have to list all of the possible homozygous genotypes and heterozygous genotypes for a:
1) a gene with two alleles called T and t
2) a gene with three alleles called A1, A2 and A3

For the first one, I was thinking it may be something like:
-possible homozygous: TT and tt
-possible heterozygous: Tt and tT

I am not so sure with that second one though. May someone please lend me some assistance? Thank you!

Question

I am just a little confused with this question:

So, in a diploid organism, I have to list all of the possible homozygous genotypes and heterozygous genotypes for a:
1) a gene with two alleles called T and t
2) a gene with three alleles called A1, A2 and A3

For the first one, I was thinking it may be something like: 
-possible homozygous: TT and tt
-possible heterozygous: Tt and tT

I am not so sure with that second one though. May someone please lend me some assistance? Thank you!

shrutipande9 · Answer

u r right with the homozygous one....in heterozygote the order of the allele doesnt matter bcuz u get only 1 phenotype if u write tT or Tt. conventionally the dominant allele is written first. so u get only 1 combination ie Tt.