What additional information would assist you in determining whether polar bears and grizzlies are different species, based on th
e biological species concept? I. whether the F1 is fertile
II. whether F1 offspring are viable
III. the amount of DNA sequence divergence between polar and grizzly bears
IV. the geographic distribution of polar and grizzly bears
a. II only
b. I only
c. III and IV only
d. I and III only
e. I and II only
According to the biological species concept, a species is the population of organism in which the individual are able to interbreed with each other and also able to produce viable and fertile offspring.
Therefore here to determine whether polar bears and grizzlies are different species we have to get information that whether the F1 generation of grizzlies and polar bears is viable and able to produce their own offspring that means are F1 generation fertile. So the correct answer is e. I and II only.
The two chromatids of a duplicated chromosome are held together at a region of DNA called the centromere. Centromeres are the attachment points for microtubules, which are responsible for the guiding the movement of chromosomes during mitosis and meiosis.
I believe the correct answer among the choices given above is option B. It is the tissue called phloem that the food travel from the leaves to the bulb. Phloem is a vascular tissue in plants that process sugars and other products.Hope this answers the question.
