Example III
Robertson, et al. 1944. Jour. Am. Soc. Agron. 36:66-72
| Phenotypes |
V_F_ |
V_ff |
vvF_ |
vvff |
Total |
| Observed |
(r) |
(s) |
(t) |
(u) |
(n) |
| F2
Repulsion |
753 |
292 |
351 |
19 |
1415 |
| F2
Coupling |
1064 |
223 |
259 |
218 |
1764 |
Repulsion ratio ru/st = 753(19)/292(351)
= 14307/102492 = 0.1396
Rather than solve the quadratic formula using
we can just look up 0.1396 in Table 2. The recombination
faction is 24.5%. We can find the s.e.(
)
from tables by Immer.
For the coupling data we solve for
using coupling ratio:
st/ru = (223)(259)/(1064)(218) = 57757/231952
= 0.2490
We can see from the table that the associated
value is 0.318. The associated s.e.()
is determined using:
