Second Generation

RR Rr rr RR RR Rr RR RR

White 0.125 Pink 0.25 Red 0.625

R = 0.75 r = 0.25

figure 16-4

This flock of mallards, Anas platyrhynchos, likely violates some or all of the conditions necessary for Hardy-Weinberg genetic equilibrium.

figure 16-4

This flock of mallards, Anas platyrhynchos, likely violates some or all of the conditions necessary for Hardy-Weinberg genetic equilibrium.

Word Roots and Origins equilibrium from the Latin aequilibris, meaning "equal balance"

The frequencies of all genotypes expected in the second generation must add up to 1.0, just as fractions of a whole must add up to 1. Having established the probabilities of getting an RR and an rr plant, we can compute the expected frequency of the Rr plants. All those plants that are neither RR nor rr will be Rr, so

1.0 - frequency of RR - frequency of rr = frequency of Rr 1.0 - 0.5625 - 0.0625 = 0.375

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