Horizontal gene transfer involves the transfer of genetic material between different organisms, such as bacteria exchanging genes through processes like transformation, transduction, or conjugation. Vertical gene transfer refers to the transmission of genes from parents to offspring, typically through sexual reproduction in eukaryotic organisms.

the transfer of gene to the embryo in order to produce transgenic offspring is known as gene transfer through embryo.

transfer of gene with the help of Ti plasmid present in Agrobacterium which has T-dna region by which gene van transfer.

when a gene transfer to a person then other person is scared of the gene

When genes transfer the tra gene nicks the DNA at its origin of transfer creating a pilus so the chromosome (which contains the gene) can transfer to the other DNA.