One parent is Aa and the other is aa : Their child has a 50 % chance of being Aa ( heterozygous ) and a 50 % chance of being aa ( homozygous ). 50 % dominant and 50 % recessive .
One parent is Aa and the other is AA : Their child has a 50 % chance of being AA ( homozygous ) and a 50 % chance of being Aa ( heterozygous ). 100 % dominant .
|
a |
a |
A |
Aa |
Aa |
a |
aa |
aa |
|
A |
A |
A |
AA |
AA |
a |
Aa |
Aa |
HOW DO WE SEE CHROMOSONES ?
Modern scientific techniques allow scientists to extract DNA from tissue samples and pool together tiny amounts of DNA from thousands of different cells . allowing scientists to distinguish different pairs of chromosomes from one another .
Actually visualizing the double-helical structure of DNA requires special imaging technology , such as X-ray diffraction . But it is still possible to see DNA using a standard light microscope by painting the chromosomes onto a glass slide with chemicals . The resulting banding patterns that appear on the individual chromosomes are unique to each pair of chromosomes ,