In sexually reproducing organisms, genes are transferred via

Gametes (sperm and ovum/egg)

Explanation:

A gene is the molecular unit of heredity in every living organism. These genes are a segment of the nucleic acid that stores them (DNA). Genes hold the information to build and maintain an organism's cell and also pass genetic traits to offsprings.

In sexually reproducing organisms, these genes are transferred through gametes. Organisms that reproduce sexually are capable of producing sexual cells called gametes which fuses together in a process called fertilization. The gamete produced by female species is called ovum or egg while that produced by male species is called sperm. A gamete carries half the genetic information of the organism producing it.

Every organism that undergoes sexual reproduction is capable of producing gametes by a type of cell division called MEIOSIS. Meiosis is a type of cell division that results in four daughter cells (gametes) in which each have half the number of genetic material as the parent cell. Hence, meiosis is a reduction division. This means that a male species of a sexually-reproducing organism will undergo meiosis to produce sperm cells while the female species will undergo meiosis to produce ovum/egg.

During sexual reproduction, the sperm fuses with the egg and fertilizes it, producing a ZYGOTE, which possesses genetic material from both gametes.

N.B: Each gamete contains genetic material of the organism producing it, hence, they are transferred to their offspring (s).

This is why most sexual-reproducing organisms are diploid (2n) i.e they possess two sets of chromosome. The diploid (2n) organisms undergo meiosis to produce haploid (n) gametes, containing half of the parental genetic material. These haploid gametes fuses to produce a diploid zygote which eventually grows into an adult organism containing the genetic material of both parents.

the answer is cell division : )

a symbiotic relationship with the mitochondria