Write two characteristics in which male gametes are different from female gametes.

Male gametes (sperms) are motile and produced in enormous quantities, while female gametes (ova or eggs) are non-motile and produced in limited numbers. Sperms possess a tail (flagellum) that propels them through the female reproductive tract toward the egg, actively swimming distances that are thousands of times their own length. A healthy adult male produces hundreds of millions of sperms daily, with each ejaculation containing 200-500 million sperm cells, compensating for the high attrition rate during the journey to fertilization. In contrast, eggs lack independent movement and are typically transported through the female reproductive tract by ciliary action and muscle contractions. Human females release only one mature egg per monthly cycle (approximately 400-500 over a lifetime), reflecting the significant energy investment required to produce large, nutrient-rich gametes.

The size and resource content of these gametes differ dramatically as well. Sperm cells are among the smallest cells in the human body, measuring approximately 50-60 micrometers in length, with minimal cytoplasm containing just enough mitochondria to power their journey and the genetic material in the head. They contribute essentially only DNA to the zygote. Eggs, conversely, are the largest human cells, approximately 100-120 micrometers in diameter (visible to the naked eye), packed with cytoplasm containing nutrient reserves, organelles, proteins, and molecular machinery necessary to support early embryonic divisions before implantation. The egg contributes not only genetic material but also the initial cellular resources and mitochondria (which carry their own DNA) that sustain the zygote's development. This fundamental asymmetry—many small, mobile male gametes versus few large, stationary female gametes—reflects different reproductive strategies and represents a pattern conserved across most sexually reproducing species.