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Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings

PowerPoint Lectures for Biology, Seventh Edition

Neil Campbell and Jane Reece

Lectures by Chris Romero

GENERATIF REPRODUCTION IN ANIMALSGENERATIF REPRODUCTION IN ANIMALS


1. Animal Gametogenesis

SPERMATOGENESIS• Occurs in sperm producing organ called testis by

special cells called spermatogonia (sperm parent cell).


Spermatogonia then

experience mitosis to

form primary

spermatocyte. 1

primary spermatocyte

will experience

meiosis I to form 2

secondary

spermatocytes. Each

secondary

spermatocytes

experiences meiosis II

to form 4 spermatid

cells. Spermatid then

will differentiate in to

sperm cell.


1. Animal Gametogenesis

OOGENESIS• Occurs in the ovarium


Oogenesis started by mitosis from oogonium to

form prymary oocyte. Prymary oocyte then will

divide itself in meiosis I to form 2 cell which are

different in size. The larger cell is called secondary

oocyte and the smaller cells is called polar body I.

Oocytes then experience meiosis II to form 2 different size cells again. The larger cell is called ootid and the smaller cels is called polar

body II. Polar body I will experience meiosis II to form

polar body II. Ootid will develop become temporary ovum while 3 polar body II

degenerated.


Internal Fertilization, occurs inside the female body.

External Fertilization, occurs outside the female body. In external fertilization, male and female gametes will be produced and excreted in large numbers to the environment (ussually in the water or wet condition)

Fertilization





The Human Reproductive System The Human Reproductive System



• Testis – male gonads• Epididymis - structure in the male

reproductive system in which sperm fully mature and are stored – Sperm is produced in the seminiferous tubules

• vas deferens - tube that carries sperm from the epididymis to the urethra

• Prostate gland – large gland that secretes semen directly into the urethra

• Urethra - tube through which urine and semen are released from the body

• Penis - external male reproductive organ that connects the urethra to the outside of the body

• Spermatogenesis – the meiotic process of sperm production


Female Reproductive System


• Ovaries – where meiosis occurs • Fallopian tubes (oviduct) – where

fertilization occurs; after ovulation the egg moves through the oviduct to the uterus.

• Uterus – where the blastula stage of the embryo will implant and develop during the 9 month gestation.

• Vagina – birth canal.

• Cervix – mouth of the uterus.

• Endometrium – lining of the uterus.

• In addition to producing eggs, the female reproductive system prepares the female’s body to nourish a developing embryo.


• Follicle - cluster of cells surrounding a single egg in the human female reproductive system

• Ovulation - process in which an egg is released from the ovary


Female Reproductive System





Fertilization and Embryo Development Fertilization and Embryo Development


Fertilization and Development

• Monoploid (n) Egg is Released• Fertilization – Usually occurs in the upper

region of the fallopian tube

Zygote – a fertilized egg• Cleavage – rapid mitotic divisions which

occurs after fertilization

Zygote Morula Blastula• Implantation – Usually occurs 6 to 7 days

after fertilization.

Blastula undergoes gastrulation Gastrula• Gastrulation - process of cell migration by

which a third layer of cells is formed within the cavity of a blastocyst





Home Work:Please looking for 5 deseases in

the reproductive system

Thank You Guys

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