One hypothesis that has been proposed regarding the origin of life suggests that life evolved fromanʺrna worldʺto today’sʺdna world.ʺ
considering the properties of rna and dna molecules, which questions would direct an investigation of the most insightful test(s) of this hypothesis?

a) since ribozymes could freely enter and leave the vesicles, could these molecules have brought external dna into the cell as a less stable, but more reliable storage molecule of double-stranded dna?
b) is it likely that simple, yet stable rna molecules served as a primitive precursor to a less stable dna molecule that was more capable of storing more information?
c) is it likely that rna molecules functioned as ribozymes to synthesize dna from amino acids, and that this role was reversed when dna became the information source?
d) could rna have provided a template for dna assembly, thereby enabling a more stable molecule that is replicated more accurately?

In a hypothetical breed of dogs, coat color is controlled by two genes. there are six different coat colors in this breed: black, brown, cream, gray, silver, and tan. consider the following crosses. cross 1: black females from a lineage of all black dogs are crossed with brown males from a lineage of all brown dogs. f1 males and females are all black. when f1 are intercrossed, f2 males and females are black or brown. cross 2: black females from a lineage of all black dogs are crossed with tan males from a lineage where all males are tan and all females are cream. f1 males are black, f1 females are gray. when f1 are intercrossed, f2 males and females are black, brown, gray, or tan. cross 3: silver females from a lineage where all females are silver and all males are gray are crossed with brown males from a lineage of all brown dogs. f1 males and females are all gray. when f1 are intercrossed, f2 males are black, brown, gray, or tan, f2 females are cream, gray, silver, or tan. select the correct statements regarding the mode of inheritance of the coat color genes. a) both genes are x-linked. b) both genes are autosomal. c) one of the genes modifies the expression of the other gene. d) each gene has an additive effect on the intensity of coat color. e) each gene independently specifies three colors. f) one of the genes is autosomal, and the other is x-linked.

Which best describes what you will do in the reaching your academic potential course?

The distribution of related animals and plants across the world