APFIVE Chi-Square Analysis of a Test Cross
A test cross between a heterozygous plant ($$Tt$$) and a homozygous recessive plant ($$tt$$) produces 80 offspring. The observed and expected phenotypic data are shown in the table.
| Phenotype | Observed | Expected |
|---|---|---|
| Tall | 42 | 40 |
| Short | 38 | 40 |
Based on the data, what is the approximate chi-square value?
A
1.0
B
0.5
C
0.2
D
2.0
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