Question

If the mother is a carrier of colour blindness and the father is normal, the possible genotype and the phenotype of the offspring of the next generation, with the help of a punnet square.

Answer 1

Colour blindness is an X-linked recessive disorder

• Mother is the carrier for colour blindness and Hence, the genotype of Mother must be X^CX
• Father is normal, hence the genotype of the father must be XY

By using punnet square, the possible genotypes and phenotypes in next generation will be

	X	Y
XC	XCX	XCY
X	XX	XY

Possible Genotypes - X^CX, X^CY, XX and XY

Possible Phenotypes -

X^CX = Carrier daughter

X^CY = Affected son

XX = Normal daughter

XY = Normal son