Aperson with down syndrome has an additional #21 chromosome in every somatic cell. this condition is also called trisomy 21. the cause of this syndrome

The answer is C.) Is through the union of a normal gamete with a haploid amount of chromosomes (n) and another gamete with an extra #21 (n+1)

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both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.