How many spermatozoa are formed from one secondary spermatocyte ?
A primary spermatocytes completes the first meiotic division (reduction division) leading to formation of two equal haploid cells called secondary spermatocytes (each has $\mathrm{n}=23$ chromosomes). The secondary spermatocytes undergo the second meiotic division to produce four equal haploid spermatids.
Polar bodies are formed during
Spermatogonia undergo ....... to produce spermatozoa
Ejaculation of human male contains about $200 -300$ million sperms, of which for normal fertility ____ $\%$ sperms must have normal shape and size and at least ____$\%$ must show energetic motility.
What is oogenesis? Give a brief account of oogenesis.
$A$ - Acrosome possesses mitochondria.
$R$ -Middle piece of sperm is filled with enzymes