The haploid human genome contains about 3 × 109 nucleotides. on average, how many dna fragments would be produced if this dna was digested with restriction enzyme psti (a 6-base cutter)? rsai (a 4-base cutter)? how often would an 8-base cutter cleave?
i'm looking for how to work the problem, not just the answer. my guess, to start, is:
4 nucleotides, 6-base cutter; 46 = 4096
( 3x109 ) / 4096 = 73,2421.875
pstl would have aprox. 73k fragments?

. shsvgd

The answer would be c, white eyes are homozygous recessive. in the early 1900s, morgan conducted several experiments with vinegar  flies (drosophila). one  sample revealed an anomaly: a  white-eyed, single male fly. he attempted to breed this fly with the typical red-eyed females. the offspring were all red-eyed. using flies from this new generation (brother-sister pairs)  produced some red-eyed and a few white-eyed flies. the white-eyed were all male. in later experiments, he was able to produce white-eyed females. this proved that white eyes are not lethal to either sex (ruling out a and b). since the percentage of white eyes to red eyes is so low, white eyes are not a dominant trait. it would be a recessive trait.