question_answer

A marriage between normal visioned man and colourblind woman will produce, which of the following type of offsprings ?

A)  Normal sons and carrier daughters

B)  Colourblind sons and carrier daughters

C) Colourblind sons and 50% carrier daughters

D)  50% colourblind sons and 50% carrier daughters

Correct Answer: B

Solution :

Colourblindness is a recessive sex-linked defect in which human beings are unable to distinguish red and green colours. Gene complement of a colourblind woman is\[{{\text{X}}^{\text{c}}}{{\text{X}}^{\text{c}}}\], that of colorblind man\[{{\text{X}}^{\text{c}}}\text{Y}\]and carrier woman with normal vision \[\text{X}{{\text{X}}^{\text{c}}}\]. A marriage between normal visioned man and colourblind woman will produce colorblind sons and carrier daughters.