Blog Nov. 30th
November 30, 2009
How do the following organisms differ in their reproduction:
a. bird
b. human
c. ants
d. sea stars
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Most of the animal reproductive systems lay eggs holding other life forms,but the human reproductive system has egg saclike organ that hold a life form after it has dilivered sperm.
A. Birds- Male birds do not have penises like the male human does. Birds match up their cloacas by the male bird getting on top of the female bird and sperm fertilizes the eggs. Birds do not have sex like humans do.
B. Humans- Male humans have a penis and humans have sexual intercourse. Sex is where the penis is inserted into the female’s vagina and millions of sperm travel to fertilize the egg which are released monthly usually one at a time by the female human. If a sperm fertilizes the egg then cells begin splitting and a baby is formed.
C. Ants- This is a complex system unlike the simple human reproduction and there are many dynamics to how ants reproduce. Only the queen ant actually has sex with the males who are fertile. Workers are sterile females and they never have sex. Winged ants are fertile males and females. Only the queen ant lays eggs. go through complete metamorphosis egg, larva, pupa, and adult. The queen mates with male ants and stores the sperm in a special organ, her unfertilized eggs can actually hatch into males. The queen can decide which sperms are released into her eggs. She lays eggs for the rest of her life.
D. Sea Star- Sea Stars reproduce by free- spawning. free-spawning: which means they release their gametes into the water where they are fertilized by gametes from the opposite sex. Sea Stars do not have sex. The do have chemical signals that tell each other when they are ready to spawn which helps them know when to gather and many of them will spawn in the same area to make the chances greater of reproduction.
Summary: Sea Stars spawn in groups unlike Birds and humans which takes only two to reproduce, humans sexually, birds by two being close and ants have one queen who is in charge that has sex with many males then spends her life laying eggs. The differences between these four creatures are amazing and quite different. By Nathan Davis
They are different sizes and it happens different
bird- lay egg
human- child develops inside mothers womb
ant- queen ant lays all eggs
sea star- part off the largest arm pinches off and that is the offspring
1.bird-lays eggs
2. human-reproduce sexualy, live birth
3. ants-reproduce asexualy
4. sea stars- reproduce by fragmentation
a. bird-lay eggs
b. human-have fully developed babies
c. ants-queeen ants have larva
d. sea stars-free-spawning.
Blog for December 19, 2009
1. Birds- always lay eggs
2. Humans- have babies, and sexually reproduce
3. Ants- There are Queen ants and they have larva
4. Sea Stars – Sea stars reproduce by fragmentation