Editing Quantitative genetics (section)

==== The mean after long-term self-fertilization====
The contribution of '''AA''' is <math display="inline"> p (+a)</math>, while that of '''aa''' is <math display="inline"> q (-a)</math>. [See above for the frequencies.] Gathering these two '''a''' terms together leads to an immediately very simple final result:

<math display="inline"> G_{(f=1)} = a(p-q)</math>. As before, <math display="inline"> P = G + mp</math>.

Often, "G<sub>(f=1)</sub>" is abbreviated to "G<sub>1</sub>".

Mendel's peas can provide us with the allele effects and midpoint (see previously); and a mixed self-pollinated population with '''p''' = 0.6 and '''q''' = 0.4 provides example frequencies. Thus:

'''G<sub>(f=1)</sub>''' = 82 (0.6 − .04) = 59.6&nbsp;cm (rounded); and

'''P<sub>(f=1)</sub>''' = 59.6 + 116 = 175.6&nbsp;cm (rounded).