Answer:
Mitochondrial DNA is useful as a molecular clock because it displays uniparental inheritance
Answer:
Because brown (B) is dominant over blue (b). Two parents who are Bb and so have brown eyes each have a 50% chance of passing a b to their child. ... By the old genetic rules, two blue-eyed parents would both be bb and so could only pass b to their kids.
Explanation:
In 1929 the American astronomer Edwin Hubble discovered that the distances to far-away galaxies were proportional to their redshifts. Redshift occurs when a light source moves away from its observer: the light's apparent wavelength is stretched via the Doppler effect towards the red part of the spectrum. Hubble’s observation implied that distant galaxies were moving away from us, as the furthest galaxies had the fastest apparent velocities. If galaxies are moving away from us, reasoned Hubble, then at some time in the past, they must have been clustered close together.
Water! It is the source of all life.
