A scientist was given some cells in a test tube .When she did karyotyping studies on these cells, she found that they each consi
sted of 23 chromosomes with only one sex chromosome in each. Half of these cells had one" X" chromosome in each of the cells and the other half had one"Y" chromosome in each of the cells. From this information, which would be a reasonable conclusion? a.
These could be cells taken from any part of the human body
b.
These are all gametes
c.
There is no way to tell what type of cells they are.
Genetic variation is the variation in alleles and genes, both within and among populations. Think of a population as a family unit. Within your family of closely-related individuals there is genetic variation. Within a neighbourhood, there are many families, and so there is also genetic variation among that larger group
Genetic variation can be identified through either continuous or discrete traits. Continuous traits are traits that vary continuously, such as height and weight. Discrete traits are traits that can only be measured discretely, such as tongue rolling; you either can or can't do this
There are three sources of genetic variation: mutation, gene flow, and sexual reproduction.A mutation is simply a change in the DNA. Mutations themselves are not very common and are usually harmful to a population.Because of this, mutations are usually selected against through evolutionary processes
Hence, the right answer is option A "genetic variation among individuals"
