Two parents with normal vision have two sons, one color deficient and one with normal vision. If this couple then has six daughters, can you predict what percentage of the daughters will have normal color vision?

Question

anonymous · Answer

So I suppose this implies that the colour deficient vision is the result of a recessive gene/trait, and is it carried on sex chromosomes?  Yikes.

anonymous · Answer

Are you given which chromosome its carried on?  I think it'd be the X-chromosome...lol

anonymous · Answer

I think they each carry the gene on one X-chromosome.  You'd create a punnett square from that and get your answer, I suppose.  I'd wait for a second opinion ^^ I don't remember much from the genetics unit

anonymous · Answer

Well, if it's sex-linked, then 100% of daughters will have normal vision, while 50% of them will be carriers of the recessive defective gene.

anonymous · Answer

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