Greg is in a bike race. At mile marker four (out of ten), his speed was measured at 13.5 mph. Which best describes the measured number? It is the average speed of the bike rider. It is the instantaneous speed of the bike rider. It is the instantaneous velocity of the bike rider. It is the average velocity of the bike rider. Which is a valid velocity reading for an object? 45 m/s 45 m/s north 0 m/s south 0 m/s

The correct answer is - It is the instantaneous speed of the bike rider.

Explanation:

Velocity is the speed with the direction so, it is a vector while speed is the specific distance covered in a unit of time, as there is no sense of direction it is scalar.

The instantaneous speed is the speed of an object at a particular or specific instant of time, in this case, the speed of the  biker is mentioned not the velocity as a direction not given

Thus, the correct answer is option - It is the instantaneous speed of the bike rider.

this protocol describes a detailed procedure for intracellular flow cytometry staining.

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.