A population of animals is split in half by a river. Before speciation is completed, the two halves are rejoined when a drought
causes the river to run dry. How would this impact the two populations? A. Traits that had developed through mutation would still exist in only one of the halves
B. Speciation would still occur because the two halves would be too different genetically to interbreed
C. The two halves would be reproductively isolated
D. Gene flow would increase between the two halves, and speciation would not occur
Answer: D. Gene flow would increase between the two halves, and speciation would not occur
Explanation:
Speciation is a phenomena of evolution of a new species from the existing parent species. This occurs when the population of the species gets separated due to geographical barrier, behavioral and due to temporal isolation (having distinct mating seasons). The members of the separated populations may undergo with genetic variations and mutations which may likely to produce a new species.
According to the given situation, if the split halves rejoined then speciation would not occur because speciation requires time for genetic variations and mutations to occur. As, a result of rejoining of the two halves the gene flow will occur due to inbreeding and speciation would not occur.
B because it’s talking about the tree itself. Saying that it’s plants would divert it to a different plant. The cells of the wood is what makes the tree and is relevant to the question
Answer: The literal reason would be because our ancestors did. The ancestors of all modern mammals had five digits on each limb up to 360 million years ago.
