A child has colorblindness. Which genotype-phenotype combination is NOT possible in the child’s parents?
---The father carries one allele and has color blindness.
---The mother carries one allele but does not have colorblindness.
---The mother carries two alleles and has colorblindness.
---The father carries one allele and but does not have colorblindness.
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I don't think that the fourth option is possible.
The father carries and allele (for colorblindness) but does not have the colorblindness himself. This is impossible because if a man has the colorblindness allele on his X chromosome he will have it because there is no dominant gene to cover it up. It cannot be carried on the Y chromosome.