What are phenotypes of parents of a colour blind son and non-carrier daughter with normal colour vision?
Correct answer: D. Mother: Normal, Father: Color blind
- A. Mother: Carrier, Father: Normal
- B. Mother: Colour blind, Father: Carrier
- C. Mother: Normal, Father: Carrier
- D. Mother: Normal, Father: Color blind
Explanation
Since color blindness is an X-linked recessive disease so if the the mother is color blind and the father is normal only then the son could be colorblind and the daughter would be carrier.
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About X-linked Recessive Inheritance
X-linked recessive inheritance involves genes on the X chromosome, so males express a recessive allele with no corresponding allele on their single X chromosome, while females may be carriers. Pedigrees cover haemophilia and red-green colour blindness, including carrier mothers, affected sons and the absence of father-to-son transmission.
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