a. false. for maternal effect genes, the phenotype of the individual is determined solely by the genotype of the individual's mother. So we know Martha's mother must have been ss because Martha is sinistral. If Martha was produced as a result of self fertilization, then martha must indeed by ss. But if Martha was produced by cross fertilization, then we cannot know Martha's genotype without more information
b. True. martha's mother is ss, so Martha must be s+s or ss
c. false. because we dont know martha's genotype, we cannot predict the phenotype of her offspring
d. false. if martha is s+s then all her children will be dextral, if martha is ss then all her children will be sinistral
e. false. martha's mother's phenotype is determined by the genotype of her mother. We know Martha's mother's genotype must have been ss so her mother's mother had at least one s allele.
f, true. because Martha's mother must have been ss, all her progeny must be sinistral