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 range of variations
Which of the following phenomena leads to variation in $DNA$?
Distance between two linked genes upon a chromosome is measured in cross over units, is
A tobacco plant which is heterozygous for albinism $(a\, recessive\,character)$ is self pollinated if $1200$ seeds are subsequently germinated, how many of the seedlings would have the parental genotype
Excessive growth of hair on the pinna is a feature found only in males because
When whole blood is stored with an anticoagulant at $4^\circ C$, the ${K^ + }$ ions move out from the $RBC$ into the plasma. The most likely reasons for this is that