Melanin is a(n) responsible for skin pigment. people who have albinism carry a mutant that does not make melanin. allele; gene gene; protein protein; allele allele; protein

The answer is protein; allele.  The protein melanin is specially produced by cells called melanocytes.  Melanin is critical in protecting against UV radiation from the sun that would cause damage to DNA and cause skin cancer. Being autosomal recessive for both alleles of the gene causes albinism.  

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math

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".