Which structure fuses to form a diploid zygote during sexual reproduction?

Sexual reproduction is a form of reproduction where two gametes fuse together which half the number of chromosomes of normal cells. Both of them are created by a specialized type of cell division known as meiosis. During sexual reproduction, a male and female gametes fuse together to form a new organism. The two haploid cells will fuse together to form a diploid cell called a zygote.

during longer space exploration trips, crewmembers may develop vision impairment risks and short-term cardiac atrophy or a decrease in the size, strength, weight, and activity of the heart during space flight because they can experience microgravity. in addition, the long-term medical condition is loss of bone mineral density and radiation exposure.