Question

please number the answers

1)The Tragopogon Triangle is one example of new species arising (speciation). Highlight all the terms below that apply to this plant group:

a) Sympatric speciation b) Allopatric speciation c) Hybrid speciation d) Polyploid speciation

2.(What makes the Tragopogon tetraploid hybrids fit the definition of new species?

3. What two events must occur in order for speciation to follow?

4.(1 pt) Give an example of a reproductive barrier that could lead to allopatric speciation.

Answer 1

Ans1. Polyploid speciation fits into Tragopon Triangle . Here, parent is 2n=12 , first generation of parent have 2n=24 which leads to flower colour change. And 2nd generation is again 2n=12 but this also not of sake colour as of parents. Hence, polyploid speciation occur.

Ans2. By the biological species concept we can consider a species as species if it's hybrid are sterile and here Tetrapogon hybrid (after ploidy level change) are fertile hence it is consider as a species.

Ans3. Ploidy level changeand reproductive isolation leads to speciation.

Ans4. Geographical barrier( mountain, river etc.) leads to allopatric speciation.