In order to determine whether variations of a character in a population were genetically controlled, the most appropriate procedure will be to
Count chromosomes and find out the variations in number in the population
Examine $DNA$ and see if the population shows any variation
Measure the variations and see if they are continuous or discontinuous
Cross individuals of both extremes and see if the offsprings and parents show the same range of variations
Study of human race is called
Mental retardation in man, associated with sex chromosomal abnormality is usually due to
In $F_{2}$-generation, quantitative inheritance $1: 4: 6: 4: 1$ is obtained instead of
The progenies are found to be male sterile after crossing two plants. This is due to some genes, which are present in
If an albino man marries with a normal woman and $50$ offsprings are albino and $50$ are normal, the woman is