colour blind mother x colour blind father
colour blind mother x normal father
carrier mother x colour blind father
carrier mother x normal father
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To explain better it means a mother possesses XX chromosome and a father XY chromosome and since the question asks for a female offspring her chromosome is xx[ one x from her mother and the other x from her father so in other for the female offspring to be colour blind, the X from her father must be colour blind likewise the x from her mother. Therefore both parents must be colour blind.
The 23rd chromosome is made up of two parts – either two X chromosomes if you are female or an X and a Y chromosome if you are male. ... So, for a male to be colour blind the colour blindness 'gene' only has to appear on his X chromosome. For a female to be colour blind it must be present on both of her X chromosomes.
