Identical twins are not genetically determined. With fraternal twins there is a very slight genetic component where a man passes the gene for releasing 2 ova to his daughter. Older, taller well-nourished mothers are statistically more likely to have fraternal twins.
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DNA molecules carry out our genes.
The answer is CHROMOSOMES.
No. They will each get the same genes that make a human a human except for the sex genes. The egg carries its' set of genes and all of the organelles including the mitochondria. The sperm carries only its' set of genes.
A vector is an organism that carries disease-causing genes into a host cell, allowing the genes to be incorporated into the host's genome. This process often occurs in genetic engineering and gene therapy techniques.
Chromosomes (DNA/genes).