Plant a and plant b are heterozygous for a gene that expresses their tall trait (tt). upon crossing, what is expected in the offspring, assuming random chromosome segregation? a) they will always have an allele that expresses the tall trait. b) they will always have an allele that expresses the short trait. c) they are more likely to have an allele that expresses the tall trait than one that expresses the short trait. d) they are more likely to have an allele that expresses the short trait than one that expresses the tall trait.