A monohybrid cross of heterozygous tall (Tt) pea plants produced 600 F1 offspring. Observed counts: 460 tall, 140 short. Expected 3:1 ratio yields 450 and 150. Chi-square = 0.89 (df = 1, critical = 3.84).
What conclusion is appropriate?
- Acheck_circle
Fail to reject the null; data fit a 3:1 ratio.
- B
Reject the null; the F1 are not heterozygous.
- C
Reject the null; the genes are linked.
- D
The chi-square calculation is invalid.
Explanation
Chi-square (0.89) is below critical (3.84), so observed and expected do not differ significantly - data are consistent with the expected 3:1 monohybrid ratio.