Is it right to say that the transgenic maize hybrids are hemizygous for the transgenic trait, once the parents were one transgenic homozygous inbred line while the other is a non-GM inbred line?
For example:
Homozygous transgenic inbred line (TT) crossed with non-GM inbred line (_ _), i.e. doesn't have any allele variations, because conventional maize doens't have the gene that comes from another species.
The outcome of this cross is a plant with only one transgenic allele (T_) given by the transgenic inbred line, a hemizygous plant.
I think hemizygous is correct since you have indeed only one transgenic allele.
For the example given, you are correct. But it is possible that for commercial hybrids that the transgene might be present in both parents, depending on if homozygosity is needed for optimal trait expression. I'd say that there is no good answer that covers all transgenic maize hybrid plants, you need to specify the parental details to be sure you are accurate.
Compliments for good information. Hemizygous is ok. But what is the feedback regarding level of trait expression in such hybrids. Whether it is capable of catering the needs of a variety
Hemizygous term used in the present example would be correct when it carries only one transgene and may be called homozygous for the transgene when it carries transgene in both the parents. The level of trait expression may differ between hemizygous and homozygous individuals having transgenes.
Thanks i got the answer to my query. Will you please give name of such hybrids and crops.
Thanks everybody for your answers!
Dr. Malhotra, I am studying maize hybrids and from my research I detected that all commercial hybrids that I worked with are hemizygous for the transgene.
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