If man evolved?

by tornapart 427 Replies latest watchtower beliefs

• 

  OnTheWayOut

  I only read p.1, but yes- from 500,000 BC to around 10,000 BC, there was no significant increase in population after it stabilized around 1 million people.

  People were hunter gatherers all that time. It was a difficult life and lifespans were short. Very few adult pairs had more than 2 children who also survived to adulthood.

  Even after agriculture started and growth picked up, there were terrible plagues and wars and still many babies/children died.

  The explosion of population is really a problem that started in the 20th century. Very easy to research on the Internet.
• 

  TD

  Another interesting thing about mammalian hybrids is that the sex of the two parent species makes a big difference

  Examples of procreative limits are: 1) the liger (tiger-lion mix) hybrid sterile male; 2) the mule (horse-donkey mix) hybrids sterile male

  To be accurate, a liger is a hybrid cross between a male lion (Panthera leo) and a tigress (Panthera tigris) If you reverse the order, (e.g. tiger/lion) you don't get a liger; you get a tigon which is a different animal. (Note the order in which the two parents are listed.)

  In the same vein, a horse and a donkey do not produce a mule but they can produce a hinny. If you want a mule, you need to breed a donkey with a horse.

  Here’s another way to look at it:

  Jack + Mare = Mule or Molly

  Stallion + Jennet = Hinny

  The sire is always listed first and this convention is reflected in their scientific names:

  Mule = Equus asinus x Equus caballus

  Hinny = Equus caballus x Equus asinus
• 

  *lost*

  yes hybrids can be created.

  hybrids are sterile, don't reproduce.

  But you cannot cross breed a dog and act, chicken and a duck etc

  Dog breeds were set before the foundation of the kennel club.

  Fox experiment in Russia.

  Some of the foxes portrayed milder temperaments in a fur farm than others.

  They selected these and started a breeding program.

  The first thing to go was the tail posture ( if my memory serves me well)

  They became more dog like in their temperament (domestic dog)

  The coat colour changed, intriduction of piebald

  Horse breeders can selectively breed for colour due to genetic identification of genes. Coloured, for gauranteed coloured off solid colour mares. Red, chestnut horses are less favoured, they can gauratee no red factor, no throwbacks.

  double muscling gene in cattle and sheep.

  all very fascinating
• 

  TD

  hybrids are sterile, don't reproduce.

  And that's wrong, wrong, wrong. Hybrids are not always sterile.

  When we're talking about animals, hybridization is mostly just a curiosity. It is powerful evidence of genetic drift.

  The situation is different with plants. Hybridization is recognized as a rapid means of speciation in plants. Here's a simple example:

  One of the most popular landscape plants in the American southwest is the Golden Barrel Cactus (Echinocactus grusonii)

  

  This is a relatively recent hybrid (Within the last five centuries or so) between true barrel cacti (Ferocactus) and Echinocactus. The result is a plant with ovaries incompatible with the parent species:

  

  Which means it does not cross back. Taken in conjuction with the fact that it does produce viable seed, the result is a new species.
• 

  *lost*

  Td I'm talking about animals not plants.
• 

  jgnat

  *lost*, not all hybrids, animal or plant, are sterile.
• 

  *lost*

  jgnat can you provide evidence for that ?
• 

  TD

  jgnat can you provide evidence for that ?

  I've already given one example. (Przewalski’s horse)

  Hybridization as far as animals are concerned is mostly evidence of how animal populations drift apart though.

  Let's not go off on a tangent.
• 

  rawe

  Hi Lost,

  "But you cannot cross breed a dog and cat, chicken and a duck etc" You can't breed a dog and a cat because they are difference species. Which of course is what we mean by species. But theory of evolution is a theory about the origin of species and in no way depends on different species being able to inter-breed. What we need to do is look backwards and ask, is it possible a dog and cat once had a common ancestor? Is that even possible? The game to play here is kill-the-theory. So... what we need to come up with is some specific evidence that would show there is no way a dog and a cat once had a common ancestor.

  Closely related species such as a donkey and horse make it easy to imagine they once had a common ancestor. But the theory of evolution goes far beyond that, it posits that even the most wildly different life forms once had a common ancestor. Thus a blade a grass and an elephant, according to the theory, stem from a common ancestor.

  Cheers,

  -Randy
• 

  Satanus

  Thread helps me understand evolution better. Carry on.

  S