Genetic Study of Inheritance in Rapid-Cycling Brassica Rappa: F1 data: -All purp

Question

Genetic Study of Inheritance in Rapid-Cycling Brassica Rappa:

F1 data:

-All purple

-All dark green

F2 data:

-369 green stem, dark green cotyledon           - 896 purple stem, dark green cotyledon

-129 green stem, light green cotyledon           - 236 purple stem, light green cotyledon

Questions:

1. Based on the F1 phenotypic data, are the anthocyaninles and yellow- green phenotypes dominant or recessive?

2. Based on the F2 phenotypic ratios, are the two genes controlling the mutant phenotypes genetically linked i.e. on the same chromosome? Explain reasoning

3. How do you make a Chi-square test for this experiment?

4. If the 2 genes are not linked, then, based on the Chi-square test, do the genes exhibit the expected Mendelian ratios? If the 2 genes are linked, then what cross would you perform to determine the map distance between them?

Explanation / Answer

1. Based on the data, the yellow-green phenotypes are recessive.

2. Yes, the two genes are linked.

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