Two pea plants are crossed. Both are heterozygous for purpleblossom color, while one is homozygous for being short and theother is heterozygous for being tall. In pea plants, tall isdominant to short, and purple flowers are dominant to white.
Fill out the table below for the probability of each possiblephenotype. Report probability as a decimal rounded to four places(e.g. 0.1250, not 1/8 or 12.5%).
| Phenotype | Probability |
| tall purple | |
| short purple | |
| tall white | |
| short white | |
In a population of 150 pea plants, there are 53 tall-purpleplants, 52 short-purple plants, 22 tall-white plants, and 23short-white plants. In order to test if the two traits areexperiencing independent assortment researchers would perform a chisquared test. The (null/alternative) hypothesis statesthat the two genes are independently assorted while the(null/alternative) hypothesis states the two genes aredependent.
What is your calculated Chi Squared statistic?
- When performing a contingency table, do not round yourexpected values!!
- Report your calculated X2 rounded to fourdecimal places
What is the corresponding P value?
- Use the formula=1-(CHISQ.DIST(X2,df,TRUE)) to convertcalculated X2into a Pvalue
- Report your answer rounded to 4 decimal places
Do you fail to reject orreject the null hypothesis?
As a result of this statistical analysis, it is possible toconclude that pea plant height and pea plant blossom color(are or arenot) linked traits.
