If an interbreeding population contains one group in which ( for example ) chromosomes A and B have fused, and another population in which chromosomes B and C have fused, both populations will be able to interbreed with the parent population.
22.
It makes this fundamental statement about evolution : " If a certain inheritable characteristic is correlated with an increase in fractional fitness, the average value of that characteristic in the child population will be increased over that in the parent population ."
23.
Such schools often need to work to guard their mission from occasional charges of elitism, support the professional growth and training of their staff, write curriculum units that are specifically designed to meet the social, emotional, and academic talents of their students, and educate their parent population at all ages.
24.
:" It took more than 60 years after 1859 until the leading specialists . . . [ agreed ] that this geographical approach was the way to solve the problem of speciation . . . a new species may evolve when a population acquires isolating mechanisms while isolated from its parent population . ".
25.
Some major problems militate against greater use of RGC in forestry, including : unstandardized techniques; unstandardized quantification; uncertain correlation between quantified RGC and field performance; variability within given, nominally identical, kinds of planting stock; and the irrelevance of RGC test values determined on a sub-sample of a parent population that subsequently, before it is planted, undergoes any substantive physiological or physical change.
