Chapter 46: Animal Reproduction
Laura Haselman
AP Biology
Block F
Asexual and Sexual Reproduction


Animals may reproduce asexually
(no fusion of egg/sperm), sexually
(fusion of gametes to form a
zygote), or they may alternate
between the two modes.
Reproductive cycles are often
related to changing seasons
example of an asexually
reproducing animal
example of a sexually
reproducing animal
External and Internal Fertilization



Fertilization is the union of sperm and egg
External: eggs are released by the female into
a wet environment, where they are fertilized by
the male
Internal: sperm are deposited in the female
reproductive tract, and fertilization occurs
within the tract
Reproductive organs produce and
transport gametes

Gametes are sexual reproduction cells

Gonads are the organs that produce gametes
in most animals

Ducts transport the gametes
Gametogenesis

Gametogenesis is the process of gamete production in
the mammalian body

Oogenesis is the development of mature ova
(egg cells)
Spermatogenesis is the production of mature
sperm cells
The reproductive cycle is regulated by
changing hormone levels in the blood


Oogenesis Model
Spermatogenesis Model
Gestation

Gestation = Pregnancy

It is the condition of carrying one or more
embryos (new developing individuals) in the
uterus (AKA the womb).

Gestation can be divided into three trimesters
Works Cited
Photograph. Healthy Aging. Carter. Web. 6 Sept. 2010.
<http://www.google.com/imgres?imgurl=http://agingresearch.files.wordpress.com/2010/08/amoeba17.jpg&imgrefurl=http://agingresearch.wordpress.com/&
usg=__2P5HXYkasaP7bcZgM2Ns6qe89zc=&h=325&w=480&sz=20&hl=en&start=0&zoom=1&tbnid=W6HcyuS1tALW3M:&tbnh=147&tbnw=197&prev=/im
ages%3Fq%3Damoeba%26hl%3Den%26biw%3D1676%26bih%3D822%26gbv%3D2%26tbs%3Disch:1&itbs=1&iact=rc&dur=234&ei=7TSETIW0GoWclgf
x8M2wDg&oei=7TSETIW0GoWclgfx8M2wDg&esq=1&page=1&ndsp=29&ved=1t:429,r:5,s:0&tx=-127&ty=-30>.
Photograph. Human Development. Web. 6 Sept. 2010.
<http://www.google.com/imgres?imgurl=https://courses.stu.qmul.ac.uk/smd/kb/microanatomy/humandev/images/Oogenesis.jpg&imgrefurl=https://courses.
stu.qmul.ac.uk/smd/kb/microanatomy/humandev/index.htm&usg=__41HhvThv0cYerdx7f8Sm28WhF3c=&h=430&w=477&sz=78&hl=en&start=0&zoom=1&
tbnid=N6EOPc3b_xwKWM:&tbnh=176&tbnw=195&prev=/images%3Fq%3Dhuman%2Boogenesis%26hl%3Den%26biw%3D1676%26bih%3D822%26gbv
%3D2%26tbs%3Disch:1&itbs=1&iact=rc&dur=281&oei=LTeETOn1KoL7lwfj2vmpDg&page=1&ndsp=32&ved=1t:429,r:0,s:0&tx=94&ty=93>.
Photograph. Rold Hicker. Web. 6 Sept. 2010.
<http://www.google.com/imgres?imgurl=http://www.hickerphoto.com/data/media/29/cute_puppy_picture_T3505.jpg&imgrefurl=http://www.hickerphoto.com
/cute-puppy-picture-7962pictures.htm&usg=__Rz8i84J3WRIPK7K3uHeVp_14Tk8=&h=311&w=468&sz=39&hl=en&start=30&zoom=1&tbnid=WlWtlegzTYxTfM:&tbnh=153&tbnw=2
20&prev=/images%3Fq%3Dpuppy%26hl%3Den%26biw%3D1676%26bih%3D822%26gbv%3D2%26tbs%3Disch:10%2C601&itbs=1&iact=hc&vpx=719&v
py=228&dur=687&hovh=183&hovw=276&tx=142&ty=107&ei=UDmETMK9L4GBlAfS0LnSDw&oei=RTmETIL1FYSclgfU27m6Dg&esq=2&page=2&ndsp=2
9&ved=1t:429,r:3,s:30&biw=1676&bih=822>.
Photograph. The Cell Cycle. Delano High School. Web. 6 Sept. 2010.
<http://www.google.com/imgres?imgurl=http://faculty.sunydutchess.edu/Scala/Bio102/PDF/Spermatogenesis.jpg&imgrefurl=http://www.delano.k12.mn.us/
sitepages/pid2663.php&usg=__Y0UwBmkpDZ8M8GhKjRV93yY4wdg=&h=607&w=542&sz=115&hl=en&start=0&zoom=1&tbnid=uqG_zdUHa8u6oM:&tbn
h=147&tbnw=131&prev=/images%3Fq%3Doogenesis%26hl%3Den%26biw%3D1676%26bih%3D822%26gbv%3D2%26tbs%3Disch:1&itbs=1&iact=rc&du
r=500&ei=BTeETP37KsT7lwfcnLn5DQ&oei=BTeETP37KsT7lwfcnLn5DQ&esq=1&page=1&ndsp=35&ved=1t:429,r:24,s:0&tx=57&ty=82>.