How many spermatozoa are formed from one secondary spermatocyte ?
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.
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Spermatogonia undergo ....... to produce spermatozoa
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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.
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.
- [AIIMS 2016]
What is oogenesis? Give a brief account of oogenesis.
What is oogenesis? Give a brief account of oogenesis.
$A$ - Acrosome possesses mitochondria.
$R$ -Middle piece of sperm is filled with enzymes
$A$ - Acrosome possesses mitochondria.
$R$ -Middle piece of sperm is filled with enzymes