An EDTA solution was prepared by dissolving approximately 4 g of the disodium salt in approximately 1 L of water. An average of 42.35 mL of this solution was required to titrate 50.00-mL aliquots of a standard that contained 0.8717 g of per liter. Titration of a 25.00-mL sample of mineral water at pH 10 required 18.81 mL of the EDTA solution. A 50.00-mL aliquot of the mineral water was rendered strongly alkaline to precipitate the magnesium at . Titration with a calcium-specific indicator required 31.54 mL of the EDTA solution. Calculate

The correct answer is -

genotype: rr

phenotype: black eyes.

As per the information in the question, red eyes is a dominant trait and black eyes is a recessive trait.

Dominant trait (depicted by capital letter allele such as R) is the one that masks the expression of a recessive trait (depicted by small letter allele such as r).

This means that recessive trait is only expressed when its genotype (genetic makeup, represented by gene variants) is homozygous recessive (both alleles are same and recessive, such as rr here) .

Thus, rr represents genotype for black eyes, which is a phenotype (physical trait).