The great abundance of some cosmopolitan species has led to an underestimation of the fact that many of the asteraceae are endemic. Many species have a very narrow current distribution and possess certain characters that make them susceptible to local or definitive extinction. you could focus on that

You can read Mendels experiments on sweet peas

Dear @Suman Paul Members of this family has both autogamous (lettuce) and allogamous (sunflower) breeding systems. If you are interested to know the breeding behavior of other plants of the "Asteraceae" family, by pollination control you can discover whether the representative plant is auto- or allogamous. For details of systems of pollination control, you can go through the chapter in the book "Principles of Plant Breeding" written by RW Allard.

Best wishes, AKC

Thank you Arbind K. Choudhary sir for your kind suggestions.