Speciation occurs when two species evolve from a ____ ancestor. A ____ is a group of similar organisms that can breed together to produce fertile offspring. Speciation can occur when two populations become ____ isolated from each other. Two populations can be geographically separated either side of a ____ range. The ____ either side of a geographically barrier can be very different. ____ will favour different characteristics in the populations either side of a geographical barrier. Different versions of ____ will be passed on to offspring depending on the characteristic for which they code. New versions of genes may appear through random ____. The gametes of the two new species may not ____ together in fertilisation. The species with whom humans share the most recent common ancestor is the ____.

Year 9 Speciation

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