To control for experimenter bias as well as extraneous variables such as severity of condition, attitudes, and age, researchers use assignment in establishing their experimental and control groups.

random                                            

Explanation:

Random assignment: In scientific or psychological research, the term random assignment is defined as the utilization of chance procedures in psychological research pr experiments to make sure that every subject or participant involved in a particular study gets the equal opportunity of getting assigned in any of the group, for example, treatment group or experimental group, etc.

In the question above, the given statement states the use of random assignment.

the answer is "meiosis ii in the mother".

the procedure of meiosis includes two divisions of the hereditary material. the main division is known as the decrease division – or meiosis i – on the grounds that it lessens the quantity of chromosomes from 46 chromosomes or 2n to 23 chromosomes or (n depicts a solitary chromosome set). in people, the decrease division results in two sperm cells each with 23 chromosomes or an egg cell with 23 chromosomes and one disposed of polar body. the second division – or meiosis ii – is called equational division. the two sperm cells split again creating four sperm cells, each with 23 or n chromosomes. in oogenesis, the egg cell and polar body partition to shape the ovum and two extra polar bodies. along these lines, the posterity are guaranteed to get one portion of the chromosomes from the mother and one half from the dad.