In penguins, alleles of many genes cause blindness. Blindness alleles can be either dominant or recessive. You have two true-breeding strains of blind penguins and a true breeding normal penguin strain. You make a series of crosses: Cross 1: females from strain 1 and true-breeding normal penguins give rise to blind male penguins and normal female penguins. Crosses 2 and 3: females (Cross 2) or males (Cross 3) from strain 2 with true-breeding normal penguins give rise to only normal penguins. Cross 4: males from strain 1 and females from strain 2 give an F1 of only blind penguins. Cross 5: F1 litter mates from cross 4 give rise to F2 litters where all male penguins are blind while 3/8 of female penguins are normal and 5/8 of female penguins are blind. a) How is blindness inherited in strain 1 and in strain 2? Support your answer. b) Using appropriate symbols, indicate the genotypes of the two blind strains and the genotypes of the F1 litter mates from cross 4 and the F2 progeny described in cross 5.