In rabbits, spotted coat (S) is dominant to solid color (s) and black (B) is dominant to brown (b). A true-breeding black spotted rabbit is mated to a true-breeding brown solid rabbit to produce a heterozygous F1 generation. Two F1 individuals are mated, and you do not see the typical 9:3:3:1 ratio of offspring, so you take an F1 rabbit and perform a test cross. Instead of the expected ratio, you see that most progeny look like the parental rabbits but a few are new, unique phenotype. This tells you that:

relationships play a major role in a human's emotional and mental wellbeing. healthy relationships with the people around you are even linked to a smaller production of cortisol, a stress hormone.

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint

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the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.