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Toss Up - Biology - Multiple Choice

A child who excretes black urine is born to two normal parents. The child has a recessive homozygous genotype. What is the most likely explanation for the genotype?
W) Spontaneous mutations
X) Consanguinity [kon-sang-GWIN-i-tee]
Y) Anticipation z) Environmental exposure

ANSWER: X) CONSANGUINITY