The type of mutation which is observed here is substitution mutation. According to the fact that sickle cell anaemia is occuring at the at beta-globin gene, the correct answer is c.substitution mutation as it shows mutation point as <span>a single base. Hope it will help! Regards.</span>
Geographic isolation leads to allopatric speciation
Explanation:
-One species could split into two if a physical barrier (such as a new river, divided its geographic range)
- If the barrier is large enough, gene flow between them would cease and the two separate populations would evolve independently.
- Different alleles would be fixed in them; because of the hazards of mutation and drift, or because selection favored different characters in the two.
- Then if the barrier is removed and the populations are reunited, they might remain distinct from each other.
- There would now be two species where there was formerly one.
Experiment 1 because cacti produce their own water