WebExplain how the trunk of an elephant evolved using Darwin's theory of natural selection, and then Lamarck's theory. According to Darwin's theory, genetic variation within the population means that some elephants are born with longer noses. Longer noses are better suited to the environment, ... Web16 de jun. de 2009 · Exploitative selection imposed by fishing tends to reduce the frequency of desirable phenotypes through directional selection for alternative phenotypes, unlike other human-induced forms of selection, such as domestication, which often produce maladapted phenotypes indirectly by favoring alternative optima through alteration of the …
All Aboard The Ele Express! Natural Selection
Web8 de jun. de 2024 · Figure 19.3 B. 1: Types of natural selection: Different types of natural selection can impact the distribution of phenotypes within a population.In (a) stabilizing selection, an average phenotype is favored.In (b) directional selection, a change in the environment shifts the spectrum of phenotypes observed.In (c) diversifying selection, … WebBecause elephants have been extensively hunted for ivory for more than 300 years, natural selection is often proposed as the underlying mechanism for an increase in the proportion of tuskless or small-tusked elephants in a population. After all, it does sound right: if animals with small or no tusks are more likely to survive, & their relative ... garage leigh road wimborne
From wild animals to domestic pets, an evolutionary view of ...
Web23 de sept. de 2016 · Most African elephants have tusks, but some — about 2% to 6% of females and even fewer males — never grow them. Elephant tusks are important for obtaining food and water, and essential … Web27 de mar. de 2024 · It's not natural selection that is causing elephants to evolve without tusks, says Ryan Long, a researcher who has studied the elephants at Gorongosa National Park. It's an artificial selection ... Web26 de feb. de 2024 · In addition to the African savanna elephant reference genome, we generated genome-wide data from 14 proboscidean specimens, one of which was from the same savanna elephant individual from which the reference genome was sequenced (SI Appendix, Note 3).Using Illumina paired-end reads, we performed deep shotgun … garage leopardstown