Message:

<p>[QUOTE=&quot;calcol, post: 3072520, member: 77639&quot;]Yeah.&nbsp; Speciation has been changing for the last 2-3 decades.&nbsp; For centuries, it relied mostly on anatomy.&nbsp; Now DNA is considered as well.&nbsp; For two differently appearing groups of animals to be considered the same species, they had to be able to interbreed and produce fertile offspring.&nbsp; However, the ability to do so has not necessarily been considered proof that they are the same species.&nbsp; Even with DNA, how similar does it have to be to prove same species?</p><p><br /></p><p>With reproductive technology and genetic engineering it&#039;s been possible to confuse things even more.&nbsp; For example, it&#039;s possible to mix cells from embryonic sheep and goats to produce an animal that is a&nbsp; mixture of the two species.&nbsp; They&#039;re called chimeras after the Greek mythological beast which appeared on coins of Sikyon 1700 years ago.&nbsp; See pic below. They&#039;re not hybrids though; any cell in the animal is either goat or sheep but not a combo.&nbsp; That includes the gonads, so they breed as either a goat or a sheep but not a mix.</p><p><br /></p><p>Cal</p><p><br /></p><p>[ATTACH=full]772241[/ATTACH] </p><p><br /></p><p>Chimera on silver stater of Sikyon, 300-304 BC.[/QUOTE]</p><p><br /></p>

Your name or email address:

Do you already have an account?

• No, create an account now.
• Yes, my password is:
• Forgot your password?

Stay logged in