26.3- Spermatogenesis occurs in the testes and produces mature sperm

Cytokinesis

cell division

how many sperm will eventually be produced from each primary spermatocyte ?

four haploid sperm will be produced from each diploid primary spermatocyte

spermatogenesis

sperm production; involves (1) mitosis and cell division (cytokinesis) (2) meiosis (3) spermiogenesis

structure of a sperm; the _____ is a flagellum, a whiplike organelle that moves the sperm

tail

spermiogenesis

the differentiation of immature male gametes into physically mature sperm

(T/F) the tail of the sperm is the only flagellum in the human body

T

define spermatogenesis

The production of sperm and involves mitosis, meiosis, and spermiogenesis

mitosis

-part of somatic cell division -producing two daughter cells each containing identical pairs of chromosomes

spermiogenesis (physical maturation); each spermatid matures into ____ sperm

1

paternal chromosome

a chromosome inherited from the father

meiosis

a special form of cell division involved in gamete production

structure of a sperm; the _________ is a membranous compartment containing enzymes essential to fertilization

acrosome

list the structures of a sperm

acrosome, head, neck, middle piece, tail (flagellum)

mitosis of spermatogonia; one of the daughter cells is a spermatogonium that remains in contact with the ________ membrane of the tubular

basement

haploid

contain only one member of each pair of chromosomes -ex. gametes produced from meiosis

diploid

containing two sets of chromosomes -ex. daughter cell

oocytes

female gametes

Meiosis II lasts a _____ hours

few

Meiosis II: the secondary spermatocytes soon enter meiosis II, which yields 4 _______ spermatids, each containing __ chromosomes

haploid, 23

structure of a sperm; the _____ is a flattened ellipse containing a nucleus with densely packed chromosomes

head

a ___________ ________ lacks an endoplasmic reticulum, Golgi apparatus, lysosomes, peroxisomes, inclusions, and many other intracellular structures

mature sperm

structure of a sperm; the ________ ____ contains mitochondria arranged in a spiral around the microtubules. _________ provide the ATP required to move the tail

middle piece, mitochondria

phases of spermatogenesis

mitosis, meiosis I, meiosis II, spermiogenesis (physical maturation)

structure of a sperm; the _______ contains both centrioles of the original spermatid. the microtubules of the distal centriole are continuous with those of the middle piece and tail

neck

mitosis of spermatogonia; the other daughter cell is a _________ ___________ that is displaced toward the lumen

primary spermatocyte

The events in the nucleus are the ______ for the formation of sperm or oocytes

same

Meiosis I: at the end of meiosis I, the daughter cells are called __________ _________

secondary spermatocytes

____ is a mobile carrier for the enclosed chromosomes

sperm

spermatogonia divide to produce sperm in a process called ___________

spermatogenesis

each mitotic division of a stem cell within the seminiferous tubules produces one daughter cell that remains a ______ cell and one daughter cell that enters _________

stem, meiosis

in __________, the corresponding maternal and paternal chromosomes come together

synapsis

a matched set of four chromatids is called a ________

tetrad

spermatogonia

the stem cells in the seminiferous tubules that divide to produce sperm in a process called spermatogenesis

mitosis of spermatogonia; the progression from spermatogonium to primary spermatocyte takes ___ days

16

mitosis of spermatogonia; each division of a diploid spermatogonium produces __ daughter cells

2

Meiosis I: each secondary spermatocyte contains ____ chromosomes, each with a pair of duplicate _______

23, chromatids

synapsis involves ___ pairs of chromosomes, and each member of each pair consists of two _______

23, chromatids

Meiosis I takes ___ days

24

spermiogenesis (physical maturation); this process from spermatids to sperm takes ___days

24

Meiosis II: for each primary spermatocyte that enters meiosis, _____ spermatids are produced

4

Meiosis (Meiosis I, Meiosis II) produces __ cells, each containing __ individual chromosomes

4, 23

the complete process of spermatogenesis occurs in ___ phases and takes ___ days

4, 64

Meiosis I: as meiosis begins, each primary spermatocyte contains ___ individual chromosomes

46

maternal chromosome

A chromosome inherited from the mother.

somatic cells (daughter cells) contain ____ pairs of chromosomes

23