Species Survival and Arrival

摘要: In principle there is no blending inheritance since characters correspond to discrete Mendelian units (genes) that are inherited quantally, in an either/or fashion, like the sex of individual. However, products allelic genes (e.g. proteins) can sometimes interact give appearance blending. Furthermore, many quantitative traits, such as height, depend on several non-allelic recombine varying proportions resulting a continuous, rather than discontinuous (quantal), distribution population. this circumstance inheritance. Linear evolution proceeds cyclically through transmission gametes, development fertilized egg adult, and gametogenesis. For line organisms avoid inheritance, must be branching into two lines (speciation) by interruption unitary generational cycle. Two independent cycles result. Since more involved or gametogenesis, if cycle genic origin it most likely first due differences between parents developmental – later trumped genes. On basis, affecting gametogenesis their child (hybrid) unlikely become manifest. Goldschmidt proposed failed because defective chromosome pairing non-genic origin. Below ‘radar screen’ natural selection, “systemic mutations” would slowly accumulate change chromosomal “patterning,” so hybrids, although otherwise healthy, sterile. Nevertheless, with fresh compatible partners, reproductively isolated remain free follow new evolutionary paths under influence selection. New species could then emerge.