Consider a diploid cell where 2n = 6. during metaphase i of meiosis, as the pairs of homologous chromosomes line up on the metaphase plate, each pair may orient with its maternal or paternal homolog closer to a given pole. there are four equally probable arrangements of the homologous pairs at metaphase i. (note that this problem assumes that no crossing over has occurred.)

Meiosis causes genetic variations which are the random arrangement of homologous chromosomes at the stage of meiosis I. At metaphase I, each pair may arrange with either paternal or maternal homolog near the given pole. Independent assortment takes place of each pair of every other pair.

A diploid cell with 2n can generate 2³ or 8 possible combinations of paternal or paternal chromosomes in the daughter cells produced. If crossing over has occurred the possible combinations would be greater than that.

Thus, the correct answer is - 8 possible combinations.

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation:

1. the energy lost to disorder metabolism     -entropy

2. related to or possessing motion potential     -kinetic

3. all of the chemical reactions in an organism required for maintenance of the processes of life entropy     -metabolism

4. possible; ability to go into action or perform work kinetic     -potential

5. the study of energy and its transformations thermodynamics     -thermodynamics