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HOW THEY DO IT! A.Purpose of reproduction 1.Replace the parents with 2 or more of the species 2.# of babies depends on the ability of the species to make.

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Presentation on theme: "HOW THEY DO IT! A.Purpose of reproduction 1.Replace the parents with 2 or more of the species 2.# of babies depends on the ability of the species to make."— Presentation transcript:

1 HOW THEY DO IT! A.Purpose of reproduction 1.Replace the parents with 2 or more of the species 2.# of babies depends on the ability of the species to make it to sexual maturity e/Laura%20Burkle%20- %20Research.html ce/resources/flower/flowertitle.h tml

2 B.Types of Reproduction 1.Asexual a.Does not mix up the genes b.Offspring are identical to the parent c.Susceptible to being wiped out anemone splitting (1:38) budding (2:47)

3 2.Sexual a.Provides for genetic variation b.Involves ½ the genes from 1 parent & ½ the genes from the other 3.Differences in nature a.Some fish change sexes b.Some creatures are hermaphrodites (have both sex organs) sea slug reproduction (1:49)sea slug reproduction (1:49) c.Sometimes the gender of the offspring is determined by the environment crocodile eggs<70° male >70° female /

4 4.Gametes sex cells egg (ovum)sperm Each of these has ½ of the genetic material 5.2 ways to have sexual reproduction a.external fertilization 1)needs water! research.unc.edu/endeavors/spr2005/sperm.php

5 2)Clams, urchins, abalone – millions of eggs & sperm are released a)No parental care (p.c.) b)Slim chances of survival courses.uvi.edu/BIO/141/Urchin.htm Coral Reef Spawning 2:33

6 3)Fish (generalizations – there are exceptions!) a)Millions of sperm are deposited near hundreds of eggs b)No p.c. c)Better chances of survival Link to stickleback mating

7 4)Frogs (generalizations – there are exceptions!) a)Male mounts the females and releases sperm as the eggs are released. b)No or very little p.c. c)Better chances of survival Link to video

8 b.Internal fertilization – on land 1)No water – need a penis 2)Egg is fertilized in the female 3)Increased chance of survival 4)Parent selection 5)Reptiles (generalizations – there are exceptions!) a)Lay eggs – can go anywhere water is in the eggs b)Little p.c. c)Great chances of survival

9 6)Birds (generalizations – there are exceptions!) a)Lay eggs female sits with eggs b)Shell around the water bag c)Food (yolk) allows for longer development d)High p.c. e)Really great survival depts.washington.edu/ubna/recreation.htm

10 7)Mammals (generalizations – there are exceptions!) a)Water bag inside mother Better protection Baby is with all times Temp. regulation Better feeding b)Long p.c. c)Fewer offspring to provide for d)really great survival!


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