A pair of plants were artificially crossed, and their progeny then allowed to self-fertilise

Self-fertilise

Q1.

In a species of plant, flower colour may be white or blue and the leaf long axis either long or short.

A pair of plants were artificially crossed, and their progeny then allowed to self-fertilise. The result in the F2  were as follows:

280 long leaf and white flower; 90 long leaf and blue flower; 94 short leaf and white flower; 30 short leaf and blue flower;

Using the information provided, explain these results as fully as possible for the three generations given, justifying your answers with written text and full genetic diagrams (with Keys) to show your logic as you proceed.  You will need to work backwards and explain the F2 results, which then give an indication of the nature of the F1, which in turn can then be used to explain the possibilities of the parental generation.                                                                                                                          (30 marks)

 

 

 

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