Think a possibility of a marraige between carrier women xxdegree and a colour blind man XdegreeY. Is there a possibility of the birth of a colour blind daughter? work out the progeny in punnett square . And explain
Answers
Inherited Colour Vision Deficiency
Colour blindness is a common hereditary (inherited) condition which means it is usually passed down from your parents.
Red/green colour blindness is passed from mother to son on the 23rd chromosome, which is known as the sex chromosome because it also determines sex. Chromosomes are structures which contain genes – these contain the instructions for the development of cells, tissues and organs. If you are colour blind it means the instructions for the development of your cone cells are faulty and the cone cells might be missing, or less sensitive to light or it may be that the pathway from your cone cells to your brain has not developed correctly.
For the sake of simplicity we refer to a colour blind ‘gene’ but this is not strictly a true description. For detailed information on the genetics of colour vision deficiency, follow this link to Genevolve.