During science class, students were instructed to develop a dichotomous key (a tool that allows the user to determine the identity of items in the natural world) in order to classify organisms into one of the six kingdoms of life. ms. king, their teacher, provided them with this diagram. according to the diagram, the best way to separate all living things into two main groups would be to consider a) method of reproduction. b) consumer versus producer. c) cell type, prokaryotic versus eukaryotic. d) organization, unicellular versus multicellular.

Option C, Cell type,  Prokaryotic  versus  eukaryotic.

Explanation:

The tool used to characterize and divide organism into groups such that each key in the entire diagram represents a small group is a dichotomous key .  At every step of the key there lies two options and choosing any one option will lead to elimination of species.  

Basic feature are used as a reference of characterization such as type of phylum, species, genus. kingdom etc. on the basis of cell type i.e prokaryotic versus eukaryotic.

Thus, correct answer is option C

an individual’s sex (i.e., whether they are a male or female) is determined by the sex chromosomes. most people have two sex chromosomes, one that is inherited from their mother and one that is inherited from their father. typically, females have two x chromosomes (xx) and males have one x chromosome and one y chromosome (xy). conditions caused by changes (“mutations”) in genes located on the x chromosome are considered x-linked.

x-linked recessive inheritance

most x-linked conditions are recessive. this means that in a person with two x chromosomes (most females), both copies of a gene (i.e., one on each x chromosome) must have a change or mutation whereas in a person with one x chromosome (most males), only one copy of a gene must have a mutation. a female with a mutation in one copy of a gene on the x chromosome is said to be a “carrier” for an x-linked condition. a male with a mutation in a gene on the x chromosome is typically affected with the condition. because females have two copies of the x chromosome and males have only one x chromosome, x-linked recessive diseases are more common among males than females. however, x-linked recessive diseases can occur in both males and females.

for x-linked recessive disorders, an unaffected carrier mother who has a mutation in a gene on the x chromosome can transmit either the x chromosome with this mutation or a “normal” x chromosome to her children. if the father is unaffected, none of her daughters will be affected and all of her daughters will be unaffected—since they will inherit at least one normal x chromosome from their father. however, each daughter will have a 50% chance of being an unaffected carrier like her mother and a 50% chance of both x chromosomes being normal.