Question

The common reed (Phragmites australis) is a perennial grass found throughout temperate and tropical regions of the world. Researchers recently discovered that many North American populations of the reed are composed entirely of genetically identical clones. Which of the following is most likely true of these populations?

1) They have a high level of genetic diversity.
2) They are composed of different species of reeds.
3) They are found only in North America.
4) They have a low level of genetic diversity.

Answer 1

The North American populations of the common reed, Phragmites australis, that are composed of genetically identical clones are likely to have a low level of genetic diversity. This is due to clonal reproduction, where individuals are reproduced from a single parent plant. The invasive behavior observed in these populations can be attributed to the introduction of a European variety with minor genetic changes.

Step-by-step explanation:

The most likely truth about the North American populations of the common reed (Phragmites australis) that are composed of genetically identical clones is that they have a low level of genetic diversity. This means that the individuals within these populations are very similar genetically, as they have been reproduced from a single parent plant through a process called clonal reproduction. This is different from sexual reproduction, which allows for greater genetic diversity among individuals.

In the case of the common reed, the invasive behavior observed in North American populations can be attributed to the introduction of a European variety of the same species. This invasive variety has minor genetic changes that make it better suited to thrive and spread in new habitats.

Therefore, option 4) They have a low level of genetic diversity is the most likely true of these populations.