Ais a segment of a chromosome that codes for a specific protein.

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.

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex