Select the scenarios that are likely due to positive assortative mating. purebred dachshunds have a higher incidence of degenerative disc disease compared to mixed breed dogs. short, muscular males from a native indigenous tribe preferentially select the tallest and slimmest muscular wives that do not resemble their own physique. a livestock breeder carefully selects cows that produce the most milk to mate with his bull. tall, slender males from a native indigenous tribe preferentially select the tallest and slimmest wives that resemble their own physique. in a large population, the frequency of the aa genotype increases over many generations. grasshoppers randomly select mates based on proximity and breed with as many other grasshoppers as possible.

The construction of phylogenetic trees is a mapping out the proposed divisions and common ancestors of all living species. traditionally, these trees have been built using morphological data, such as appearance and embryology. recently, it has been possible to construct these trees using molecular data. phylogenetic trees based on different types of information agree with each: that there is strong evidence of a real underlying common descent. this phylogenic tree is composed based on molecular data (rrna). what statements can we infer are true about the organisms throughout the tree? because the tree is rooted, all branches share a common ancestor. all organisms have some sort of cellular structure/organization. all eukaryotes evolved from bacteria. since the organisms contain rna, they share the same dna. if the organisms contain rna, the share the same four nitrogen bases.

Why is it important that fibrin is insoluble in water?

What is the importantence of the carbon and nitretan cycles in the environment