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IgorC [24]
3 years ago
15

A researcher planted 160 seeds from an F2 cross of two hybrid purple flowered plants and got 123 purple flowered progeny and 37

white flowered progeny. What was the Chi- Square value for this result?
How do we find the expected value for this problem if we are given the observe value?
Biology
1 answer:
gladu [14]3 years ago
8 0

Answer:

Chi square value = 0.3

In order to find the expected value, an assumption of purple flower colour dominance over white flower colour has to be made.

Explanation:

<em>First, we will assume that the purple flower trait is dominant over white flower trait, and that the alleles segregate according to Mendelian standard. Hence, the expected F2 phenotypic ratio will be 3:1.</em>

In order to get the Chi square, the expected phenotype frequency will be calculated thus;

Expected frequency (E) for purple flowered plants = 3/4 x 160 = 120

Expected frequency (E) for white flowered plants = 1/4 x 160 = 40

Observed frequency (O) for purple flowered plants = 123

Observed frequency (O) for white flowered plants = 37

<em>Chi square X^{2} = (O - E)^{2}/E</em>

For the purple colour flower

X^{2} = (123 - 120)^{2}/120, which gives 0.075

For the white colour flower

X^{2} = (37 - 40)^{2}/40, which gives 0.225

<em>Total X^{2} = 0.075 + 0.225, which gives 0.3</em>

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