4. In corn, purple endosperm (P) is dominant to white (p) and full (F) is domina

Question

4. In corn, purple endosperm (P) is dominant to white (p) and full (F) is dominant to shrunken (). A plant that is homozygous for purple and full is crossed with a plant that is homozygous for white and shrunken. parent. From the testcross, the following progeny are obtained: 1265 purple & full, 356 purple & shrunken, 341 white & full, and 1154 white & shrunken. Are these two traits sorting independently? Conduct a chi-square test of independence to determine if these two traits are linked. Draw a genetic map that shows the distance between the two genes that control these traits. (6 points) The resulting F1 plants are then testcrossed to the homozygous recessive

Explanation / Answer

Answer:

Based on given data:

Degree of freedom = 4 - 1 = 3

The P-Value is 0.000684. The result is significant at p < 0.05

Since, P-value is less than significance level, therefore these two genes are linked.

O E (O-E) (O-E)^2 Purple Full 1265 1168.5 96.5 7.969 Purple Shrunken 356 389.5 -33.5 2.881 White Full 341 389.5 -48.5 6.039 White Shrunken 1154 1168.5 -14.5 0.180 Chi Square 17.070

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