In a male heterozygote, the maternal allele is imprinted by methylation. Which of the following is true?
◦ Half of his sperm will carry the methylated maternal allele, and the other half will carry the unmethylated paternal allele.
◦ All of his sperm will carry methylated alleles, either the maternal one or the paternal one.
◦ His sperm will be of four types in equal amounts: methylated paternal, methylated maternal, unmethylated paternal, and unmethylated maternal.
◦ All of his sperm will carry the unmethylated paternal allele.
◦ All of his sperm will carry unmethylated alleles, either the maternal one or the paternal one.