Comparable segments of the mitochondrial dna sequences of two similar species are shown below. this segment of dna mutates at a rate of one base pair per 33 million years. based on these dna sequences, how long ago did the two species diverge from a common ancestor? species a mtdna sequence: tacaagatac species b mtdna sequence: tacgcgtaac 99 million years ago 33 million years ago 66 million years ago 132 million years ago

Ascientific idea becomes valid when it is what?

Suppose a particular species of tulip plant has three alleles for the gene that codes for flower color. the cr allele produces red tulips, the cp allele produces purple tulips, and the cw allele produces white tulips. cr is dominant over cp and cw, and cp is dominant over cw. for each of the following crosses, determine the expected ratio of offspring for each flower color. cr cp x cp cw cr cw x cp cw 1 red: 1 purple : 0 white, 1 red: 2 purple: 1 white, 2 red: 1 purple 1 white, 1 red: 3 purple : 0 white, 2 red: 0 purple : 2 white, 2 red: 2 purple : 0 white

Why were the results whit just water so much different than the trials with the detergent ?