52) The basic units that evolve species.
53) There can be : 1380848.
52) The basic units that evolve are species.
53) There can be more than two varieties of alleles for a particular gene in a population.
54) A small minority of mutations is adaptive, providing an improvement to the gene pool of the population.
55) Genetic drift has a much more significant effect on small populations than on large populations.
56) Without mutation, evolution would eventually cease, because mutations create the variation that evolution acts upon.
57) A population of salamanders migrates from a sand beach to a pebble beach and evolves over many generations from a solid color to speckled coloration. This process is called stabilizing selection.
58) If a species of bird with an intermediate beak size evolves into two varieties, one with large beaks and one with small beaks, this could result from disruptive selection.
52) The basic units that evolve species.
53) There can be : 1380848
