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The expression of yellow petals in sunflowers is due to the dominant allele Y. The homozygous...

The expression of yellow petals in sunflowers is due to the dominant allele Y. The homozygous recessive (y) has orange petals. Plant height is controlled by another gene with two alleles, T and t, with Tall (T) being dominant to short (t). Two individuals that are heterozygous for both traits are crossed, the number of offspring of each phenotype is recorded in the table below.

1. The assumption is that these two genes assort independently. To test this, complete a chi-square hypothesis test using the table below.

Phenotype observed expected
Tall Yellow 115
Tall Orange 43
Short Yellow 49
Short Orange 33

2. X2=   (round to one decimal place)

3. degrees of freedom=

4. critical value= P=.05

5. Are these two traits inherited independently?(yes/no)

P
df .1 .05
1 2.706 3.841
2 4.605 5.991
3 6.251 7.815
4 7.779 9.488
5 9.236 11.070
Math   Statistics-And-Probability   
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