By applying the rules of probability to a tt × tt cross, determine the probability of the offspring being heterozygous (tt).

The probability of the offspring being heterozygous (Tt) is 50%. They will make TT, Tt, Tt and tt zygotes. Two of these are heterozygous.

The answer is atmosphere. there are four spheres of the earth: 1. geosphere (from greek word 'geo' = ground), 2. hydrosphere (from greek word 'hydro' = water), 3. biosphere (from greek word 'bio' = life), and 4. atmosphere (from greek word 'atmo' = air). a magnetosphere is a region of space around astronomical objects controlled by the magnetic field of that object. through the process of elimination, since lightning is present in the air, it can be found in the atmosphere.