John Perkins

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Questions related from John Perkins

Is quadrivalence more common in autotertaploids or allotetraploids?

For flowering plants is quadrivalence more often associated with autotertaploids or allotetraploids? Does the presents of quadrivalents imply a neotetraploid? Is a tetraploid having quadrivalents...

08 August 2016 8,684 1 View

What might cause the meiosis in diploid species to be less regular than closely tetraploid species?

When doing flow cytometry on seed of closely related diploid and tetraploid deciduous azalea species, the ratio of the flow cytometry scores of embryo / endosperm is 2/3 for the tetraploid species...

12 December 2015 4,540 8 View

Does a .1 increment in flow cytometry scores for closely related species from 1.8 to 3.8 indicate an increase in the number or length of chromosomes?

Does a .1 increment in flow cytometry scores for closely related species from 1.8 to 3.8 normally indicate an increase in the number or length of chromosomes where 1.2 to 1.4 normally indicates...

11 November 2014 3,566 3 View

Are 3 closely related species having differing flow cytometry in a ratio of 1 to 2 to 3 more likely to differ in the number or length of chromosomes?

Let us assume we have three species S1, S2, and S3 that are members of a group G of 100 closely related species. Species S1 is not self fertile and has a flow cytometry score of 1.0 where flow...

11 November 2014 6,788 0 View

For flowering plants, can a sport of a triploid become diploid or tetraploid?

Using flow cytometry, documented sports of triploid Rhododendrons have tested as diploid, triploid, and tetraploid. The sports were documented as propagated from cuttings. Does anyone know other...

01 January 1970 6,730 2 View