Suppose a segment of mitochondrial dna (mtdna) is compared between two similar modern-day species. it is known that this segment of mtdna changes at a steady rate of one base pair every 4 million years. compare the sequences of the two mtdna segments given below. species a: gcactaagcatcgattt species b: gcaccaggcactggttc use the basic principle of molecular clocks to calculate how long ago the two species diverged from a common ancestor.

24 million years

Explanation:

A: GCACTAAGCATCGATTT

B: GCACCAGGCACTGGTTC

There are 6 base pair changes between species A and species B. Since we know the rate of change is 1 base pair every 4 million years, we know 6x 4 million is likely how long ago the species diverged. 6x 4 million = 24 million years

phaneritic textures in which phaner means visible so phaneritic textures are standard of impertinent volcanic rocks. these rocks crystallized gradually under the surface of earth. when the magma cools deliberately then the ores have chance to develop and produce long crystals.