If a man is heterozygous (aa) for a trait, predict his possible sperm. a) his sperm would not carry either of the alleles. b) 100% of his sperm would carry both of the alleles (aa) eliminate c) 50% would carry a dominant (a) and 50% would carry a recessive (a) d) 50% would carry two dominant alleles (aa) and 50% would carry two recessive alleles (aa)