Mendel was able to study seven traits in all the pea plants in each generation. which of his hypotheses allowed him to analyze each trait separately? a)-if two different alleles for a gene occur together, one of the alleles may be expressed while the other is hidden. b)-when gametes are formed, each gamete carries only one allele for the gene. c)-there are alternate versions of a alleles called genes. d)-for each inherited trait, there is only one copy of the gene that codes for that trait. the answer is: is b-when gametes are formed, each gamete carries only one allele for the gene. i just took the test and got it right