Biology for IGCSE & O level - Inheritance (Section 2 - No. 40)
If a woman has red-green colorblindness, what can you infer about her parents?
Both parents must be colorblind.
Both parents must carry the colorblindness allele.
Her father must be colorblind and her mother must carry the colorblindness allele.
Her father must carry the colorblindness allele and her mother must be colorblind.
Explanation
For a woman to be colorblind (an X-linked recessive trait), she needs to inherit the affected allele from both parents. Therefore, her father must be colorblind, and her mother must be a carrier.
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