human eggs and sperm each contain 23 ________, which are composed of long strands of ________.

Human eggs and sperm each contain 23 chromosomes , which are composed of long strands of DNA. The chromosomes are thread-like structures found in the nucleus of the cells, and each chromosome consists of a long strand of DNA that carries genetic information. Eggs and sperm are haploid cells, meaning they contain half the number of chromosomes (23) compared to other body cells that contain 46 chromosomes in pairs. When an egg is fertilized by a sperm, these 23 chromosomes from each combine to form a full set of 46 chromosomes in the resulting zygote.